Screen.WorkingArea Changed Event?

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  - 1
    - (newbie) Slow Combobox Binding I'm fairly new to winforms, but I've been playing around with ASP.NET for a while, so I'm familiar with a fair bit of the framework, however I'm having an annoying issue when trying to bind a simple arraylist to a combobox. All I want the combobox to be is a simple dropdownlist and I'll grab the SelectedValue from it to do other stuff elsewhere, so what I thought I could do is : myCombo.DataSource = myArrayList; myCombo.DisplayMember = "Name"; myCombo.ValueMember = "ID"; Where myArrayList is an ArrayList (shock!) of simple objects with the properties "Name"(string) and "ID"(int). (very basically, their class definition is just : public class myClass { myClass() {} myClass(int ID, string Name) { this.Name = Name; this.ID = ID; } public string Name; public int ID; } - it's not quite that dumb, but you get the idea) I'm finding that not only is DisplayMember *completely ignored* (i.e. all the entries in the combobox merely display "myNamespace.myClass"), but the binding process seems to take an inordinately long amount of time - somewhere up to 5 seconds. I thought initially it was a database access time or the size of the ArrayList slowing it down, but I actually reduced it to : ArrayList myArrayList= new ArrayList(); myArrayList.Add(new myClass(1, "First")); myArrayList.Add(new myClass(2, "Second")); myCombo.DataSource = myArrayList; myCombo.DisplayMember = "Name"; myCombo.ValueMember = "ID"; and it still takes seconds! Can anyone shed any light on this? thanks in advance, -- jo inferis Tag: Screen.WorkingArea Changed Event? Tag: 88150
  - 2
    - How to set the max row number in the datagrid. I use the datagrid to let the user edit the data in a table, say 6 row, 8 column, but I don't want the user hits enter at row 6 and the datagrid automatically append a new row on the datagrid (view). How can I set the max row limit? Also, I don't know if all of you have noticed, when you add just one row to a datatable and display it in the datagrid, you will see your data in the first row and a blank in the second row. Is there a way of just show one row of data but not additional blank? Thank you. lz Tag: Screen.WorkingArea Changed Event? Tag: 88148
  - 3
    - Newbie to WinForms How can I update the text form the main form StatusBar from child windows ? Tag: Screen.WorkingArea Changed Event? Tag: 88143
  - 4
    - GDI resource leaks: Calling Dispose after ShowDialog I am fighting exhausted resources in a large application with many forms. It manifests itself by EVENTUALLY not being able to load an ImageList. In researching this I see advice in previous postings to call Dispose on a form when finished with the object, after a ShowDialog. It is suggested this is necessary to avoid GDI resource leaks. My question is, what about when you open the form non-modally with Show? Will the form do its own Dispose, or am I obligated to find a way for this to happen? If so, can someone suggest a strategy for managing this? - Lee Tag: Screen.WorkingArea Changed Event? Tag: 88142
  - 5
    - When opening a form: Failed to load ImageList When opening a non-modal dialog form which has an ImageList that I use for a Treeview, the program crashes. This does not occur consistently, but certainly often enough to be very annoying. It has happened two days in a row now for one user. The exception trace suggests to me that the .NET Framework is attempting to extract the bitmaps from the DLL resources, or such? It appears to be happening before any user code is being called. I have seen others report this problem, but never a resolution. It would seem to be a Framework bug to me. But maybe there is something I am doing? Any clue why this could be happening, or more importantly, what I can do about it? ************** Exception Text ************** System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.InvalidOperationException: Failed to load ImageList. at System.Windows.Forms.ImageListStreamer..ctor(SerializationInfo info, StreamingContext context) --- End of inner exception stack trace --- at System.Reflection.RuntimeConstructorInfo.SerializationInvoke(Object target, SerializationInfo info, StreamingContext context) at System.Runtime.Serialization.ObjectManager.CompleteISerializableObject(Object obj, SerializationInfo info, StreamingContext context) at System.Runtime.Serialization.ObjectManager.FixupSpecialObject(ObjectHolder holder) at System.Runtime.Serialization.ObjectManager.DoFixups() at System.Runtime.Serialization.Formatters.Binary.ObjectReader.Deserialize(HeaderHandler handler, __BinaryParser serParser, Boolean fCheck, IMethodCallMessage methodCallMessage) at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize(Stream serializationStream, HeaderHandler handler, Boolean fCheck, IMethodCallMessage methodCallMessage) at System.Runtime.Serialization.Formatters.Binary.BinaryFormatter.Deserialize(Stream serializationStream) at System.Resources.ResourceReader.LoadObject(Int32 pos) at System.Resources.RuntimeResourceSet.GetObject(String key, Boolean ignoreCase) at System.Resources.ResourceManager.GetObject(String name, CultureInfo culture) at System.Resources.ResourceManager.GetObject(String name) at PPSManager.frmVolumeNavigator.InitializeComponent() at PPSManager.frmVolumeNavigator..ctor() at PPSManager.frmMain.PrintVolumeNavaigator(Object sender, EventArgs e) at System.Windows.Forms.MenuItem.OnClick(EventArgs e) at System.Windows.Forms.MenuItemData.Execute() at System.Windows.Forms.Command.Invoke() at System.Windows.Forms.Control.WmCommand(Message& m) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) Tag: Screen.WorkingArea Changed Event? Tag: 88140
  - 6
    - Cancel Load-event How is it possible to cancel the Load Event of a form? I do some tests in the Load event and if they fail a message box should be shown, and the form should never be shown? How to code? Best regards Benjamin SWEDEN Tag: Screen.WorkingArea Changed Event? Tag: 88139
  - 7
    - A Newbie Question Hi All, I'm trying to develop a prototype for a small Room Booking application. This is a 3 tier application. The presentation layer consists of Windows Forms. There will be multiple concurrent clients. The application needs transaction supportivity.I thought of developing in .NET C#. The data base is going to be SQL Server 2000. I thought of following the design guidelines mentioned in the MSDN,Application Architecture for .NET Designing Applications and Services from Microsoft (http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnbda/html /distapp.asp). I have some questions. For my distributed application which technology would be best suitable?. Enterprise Services COM+ components or .NET remoting or Web Services? How can I take the decision? My application needs quick response (Speed is important). Thanks in advance. Regards, Risath Tag: Screen.WorkingArea Changed Event? Tag: 88131
  - 8
    - Please help - how to call a web link in a windows form... Dear Experts, I am asked to develop a Windows Application that calls to a given web link (e.g. http://localhost/Test.aspx?id=1234) and catches the returned HTML from this link (returned from web server of course). I really have no idea on how to accomplish this. Could you please give me some hints on resolving this or please indicate any resources/references that I can refer to? Thanks a lot for your help. Tigger -- I am Tigger. Tag: Screen.WorkingArea Changed Event? Tag: 88128
  - 9
    - simply question.... can i do something like this in C# / VB.NET? ======================================================================== my $agent = LWP::UserAgent->new (requests_redirectable => ['POST', 'GET', 'HEAD']); $agent->agent("Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)"); $agent->cookie_jar(HTTP::Cookies->new(autosave=>1)); my $url="http://www.comcom.com/login.asp"; my $result = $agent->get($url); %formfields = (status => 1, username => 'myuser', password => 'mypassword'); $result = $agent->post($url, \%formfields); my $html = $result->content(); if ( $html =~ /password/i) { $errStr .= "Login to $url failed - Customer# $customerID: $"; return 0; } ======================================================================== Tnx. Tag: Screen.WorkingArea Changed Event? Tag: 88108
  - 10
    - large forms slow in designer For a while now I've been writing a point-of-sale application that has many tab pages each with lots of components. The designer is getting very slow at loading it, i'm wondering if there are any recommended practices for splitting up the tab pages? I was able to make each page its own control and although it spead things up a bit, its a pretty lame approach. What do all of you do when you have forms with hundreds of components on different pages? thanks. Lloyd SLOW30 Tag: Screen.WorkingArea Changed Event? Tag: 88106
  - 11
    - Where can I see my logs? I am developing a c++ application using windows forms. I have added to it some classes I had developed for a console application. They compile and run well, but I don't know where I can see the logs (which would give me essential information!) that those classes write using cout. Are they collected somewhere so that I can read them? Where does cout write now if anywhere at all? Thanks Tag: Screen.WorkingArea Changed Event? Tag: 88104
  - 12
    - C# Windows Forms - GDI Leaks Hi All, I'm a bit new to the windows forms world, about 95% of my work is service related, I usualy make console applications, no graphic interface, the maximum interaction with client is "Press X to stop application". Now, in the windows forms world my application gets bigger and bigger whenever I open and close a window (I'm making a MDI application) What I mean is, the number of GDI objects, the number of handles raises, the VM memory, what must I do? Should .NET framework take care of disposing all the graphic object no longer in use? If not, what can I do to prevent this? In my company we use Rational Purify to search for mem leaks in C++ or C can I use it to check leaks in C#? Thanks for all the help you can give me, Luis Pinho Tag: Screen.WorkingArea Changed Event? Tag: 88102
  - 13
    - Question about Infragistics Grid and combo box I am using an Infragistics grid and combo box. I have a table of information that I would like to edit that has a foreign key in it. I would like to show the user friendly description in the grid, then when the user clicks on the grid, the the value can be changed through the combo box. This combo is not one of the in grid combos, it is a seperate one on the form. One of my requirements for these data entry forms is that in-grid editing of data is not allowed. What is the easiest way of doing this. Most of the examples that I have seen are geared toward the in-grid combo box, not a seperate one elsewhere on the form. Tag: Screen.WorkingArea Changed Event? Tag: 88098
  - 14
    - I can't modify a MaskedTextBox control in binding. I do not succeed to modify the content of a MaskedTextBox control whose Property "OutputText" is in binding with field of type text of one table in database a MDB. The control has been generated making a drag-and-drop of the respective field from the window of the "Data Sources" of the plan and associating to same a control of the MaskedTextBox type to whose property "Mask" has been assigned the following string "00.00.00" (to represent a time). Only if i not set this property, I can to modify of the value, but in this way I do not formatting automatic input of the customer. From the same control, I want to be able to visualize the value of the field and to only modify of the value (in sure conditions). The development environment is Visual Basic .Net Express with Framework 2,0 Beta. Councils are accepted, Thanks, dumbo. Tag: Screen.WorkingArea Changed Event? Tag: 88095
  - 15
    - AutoScale Doesn't Behave How I Expect/Hope I have just been playing with AutoScale and I am unhappy with the way it appears to work. I have a form created on a desktop m/c where the screen font is Normal (96 dpi). The form looks fine at design time and runtime. I run the application on my laptop, where the screen font is set to 120 dpi (125%), and the form does not look fine. The line height of a listbox on the form is too small, labels are truncated, and things generally look cramped. AutoScale is set to True. I notice that when I open the designer on the desktop, the AutoScaleBaseSize is (5, 13). When I open the designer on the laptop it is also (5,13). If I then change the AutoScale property in the properties window and look again at AutoScaleBaseSize, it has changed to (6,15). Now when I run the application on the laptop all is well. Well, almost. I should point out that user controls on the form still do not scale correctly, and since they do not have an AutoScale property, all I can think of doing is calling the Scale() method with a parameter of 1.25. The problem with this approach is that I would have to do this for every user control, and there are a lot of them. It doesn't seem right that I have to add special code to all my user controls to get them to scale properly. Furthermore, I haven't discovered (yet) how to determine the correct scale factor at runtime. I thought that the point of the AutoScale property was that a form would display correctly on m/cs with different display settings, without having to rebuild on that m/c. It doesn't look like that is what really happens. Have I missed out a step here? Does anyone know the correct procedure for making this work? TIA Charles Tag: Screen.WorkingArea Changed Event? Tag: 88093
  - 16
    - Using a Web Browser Control on Windows Forms to display Web Archive (*.mht) File Folks, I'm trying to somehow manage to get the standard IE web browser control, hosted on a WinForm, to understand and display a "web archive" file (mywebarchive.mht) as saved by MS IE 6 (Save As - File Type: Web Archive (*.mht)). No luck so far - seems odd, since MS IE can produce and display those files just fine! What am I missing?? Thanks! Marc ================================================================ Marc Scheuner May The Source Be With You! Berne, Switzerland m.scheuner -at- inova.ch Tag: Screen.WorkingArea Changed Event? Tag: 88092
  - 17
    - Replicating Treeview (Type your message here) I have two treeview and i want when any node is added in one node= it must be automatically added to the other treeview=2E I was trying to override the Add method of treeview as well as= treenode in a class, but both the functions are in property= Nodes, so i was try to make a new method to do that ADD which= will accept the Treenode and the other Tree Control in to Which= the relicate of the original treeview is to be build , but i m= facing the problem when adding a particular node to the selected= node it gives me the Exception of type cast invalid from= myTreenode to Treenode=2E Can anybody suggest me a possible solution for replicating the= Treenodes in two or more than two Treeview having same= property=2E -------------------------------- From: kanika Gauba ----------------------- Posted by a user from =2ENET 247 (http://www=2Edotnet247=2Ecom/) <Id>vlgHaK8sqku3+beb7vki9A=3D=3D</Id> Tag: Screen.WorkingArea Changed Event? Tag: 88089
  - 18
    - Replicating Treeview (Type your message here) I have two treeview and i want when any node is added in one node= it must be automatically added to the other treeview=2E I was trying to override the Add method of treeview as well as= treenode in a class, but both the functions are in property= Nodes, so i was try to make a new method to do that ADD which= will accept the Treenode and the other Tree Control in to Which= the relicate of the original treeview is to be build , but i m= facing the problem when adding a particular node to the selected= node it gives me the Exception of type cast invalid from= myTreenode to Treenode=2E Can anybody suggest me a possible solution for replicating the= Treenodes in two or more than two Treeview having same= property=2E -------------------------------- From: kanika Gauba ----------------------- Posted by a user from =2ENET 247 (http://www=2Edotnet247=2Ecom/) <Id>LVMH0fEBCEWtmViGj3x1UQ=3D=3D</Id> Tag: Screen.WorkingArea Changed Event? Tag: 88088
  - 19
    - reportViewer in VS 2005 Where can I find some information about reportViewer control from VS 2005 Beta2 ? I can't figure out how to use it. Thank's Tag: Screen.WorkingArea Changed Event? Tag: 88086
  - 20
    - duplicate the FileWebRequest Class HI, newbie here.. What i want to do sounds very simple, but i am having a hard time getting the terms down so that i can even explain what i want to do. In any web browser where my client app is running, if there is a URL like "test://" or "dosomething://" that is clicked, i want my client app to catch that and do stuff. Please someone point me in the right direction. I have tried building an activex control but it dosnt support the DDE commands i want to use. I know that .Net dosnt either, but i am going around the whole DDE part in the long run. what i have is a phone applicaiton, i am integrating a web site with some of the parts of the phone app. when a phone number is displayed on my web app, it will have a hyperlink on like <'a href="call://201-555-1212">201-555-1212</a> This was my way of linking the two apps together (the call:// part) the phone app supports DDE, i have found a few free ocx's that will be my DDE client and server parts. But iam not worried about that for now. I just want to be able to pop up my client app when a link is clicked in IE and pass my app some variables. Thanks for any advise Tim Tag: Screen.WorkingArea Changed Event? Tag: 88085
  - 21
    - How to build moveable toolbar? SGksDQoNCkknbSB1c2luZyBDIyBpbiBWUyAuTmV0IDIwMDMuIEhvdyBjYW4gSSBidWlsZCBtb3Zh YmxlIHRvb2xiYXJzIGFzIHRoYXQgaW4gVlMgSURFLCBkcmFnZ2luZyBhbmQgYXJyYW5naW5nIHRo ZW0/ICBNb3JlLCBob3cgY2FuIHRoZSBtb3ZlYWJsZSB0b29sYmFyIGJlIHB1dCBpbnRvIHRoZSBz YW1lIGxpbmUgb2YgTWVudSwgYXMgdGhhdCBpbiBJRS4NCg0KQ2FuIGFueW9uZSBpbnRyb2R1Y2Ug c29tZSBhcnRpY2xlcyBvciBzb3VyY2UgY29kZXM/ICBUaGFua3MuDQoNCi0tIA0KIkZvcndhcmQg R2FsYXhpYSI= Tag: Screen.WorkingArea Changed Event? Tag: 88082
  - 22
    - GroupBox... hi: is there a way to trigger a contextMenu when right-clicking on the groupBox text title? thanks... Tag: Screen.WorkingArea Changed Event? Tag: 88081
  - 23
    - New Form Goes Behind Main Form when clicked. I have a main form and from it i am creating and showing a new form using the Show method. The form does not have an owner. It correctly appears on top of the main form but when i click it it goes behind the main form. If I then go bring the form to the front it is fine from that point forward. It is just the initial click after creation. I believe I have done what I describe here successfully in several apps before but I cannot figure out what is wrong here. Does anyone have any thoughts? Tag: Screen.WorkingArea Changed Event? Tag: 88080
  - 24
    - Problem Creating Handle I have a UserControl that contains a few ComboBoxes and TextBoxes. For most of the Controls/Forms that I drop this on, I'm not having any problems at all. One form, however, is giving me problems and it seems to be crashing in the CreateHandle method. I have put a breakpoint in the HandleCreated event of my UserControl, but it's never hitting it cuz it crashes before that. It's obviously having a problem creating the handle and I'm trying to figure out why. Does anybody know what event fires prior to the HandleCreated event? If I can set a breakpoint there maybe I can figure out what the problem is. TIA, ~~Bonnie Tag: Screen.WorkingArea Changed Event? Tag: 88079
  - 25
    - How Best to Move From Form to Form I've been a Web Developer for about 5 years, but am now being asked to write a Forms based application. My basic question is how best to move from form to form. I've read about MDI, ShowDialog, Form.Show(), and even just setting various forms from Visible = True to Visible = False. I guess, I'm a bit confused as to which would be the best implementation. Just to give a few details on my project... I will have a login screen, then once the user logs in I will have a main screen. Depending on the options selected on the main screen, the user will either be directed to a Delete Screen or a Copy Screen. The Delete Screen and the Copy screen really do nothing more than inform the user of actions taking place in a database. Basically just a logging/status screen. I know I'll need to implement threading for this, but I'm not sure how best to move from screen to screen. Thanks. Tag: Screen.WorkingArea Changed Event? Tag: 88075
- Next
  - 1
    - Some (not so?) general questions... Hi all. I'm primarly a C++ developer but I've been trying to complete development on a C# application with the following basic requirements: - The app runs in the background is initially hidden from the user, including the Windows Taskbar. - The app needs to receive a registered Windows message - The app needs to "register" its window handle with an unmanaged C++ dll so that a WM_USER message can be sent back to the C# app's WndProc - The app needs to display itself when receiving the WM_USER message, and hide itself after being acted upon by the user. I ran into some problems along the way and wondered if anyone could provide some feedback or comments. Especially since I told my project guy this should be trivial to do in C#, and now I'm wondering if I made the correct decision. I'm not looking good at this point. 1) In order to hide the app from the Taskbar, the main form's ShowInTaskbar property would be set to "false", easy right? That action, however, (using SPY++)removes the WS_APPLICATION style bit and prevents the application from receiving any registered Windows messages. 2) I initially call a C#-to-C++ wrapper function to give my ".Handle" to the unmanaged dll. This works for the first time, but when I set the main form's Visible property to false and minimize the form, "Handle" gets a new value. Is there some other "handle" I should be using? I work around this by "re-registering" with the unmanaged dll after minimizing but there have been a couple of occasions where a zero has been logged. Using FindWindow() in the unmanaged dll would be acceptable, is there a way to "register a unique window class"? The window titlebar includes message specific data so the title changes. 3) I have seen several instances where the main window was shown (Visible = true), but with no controls on it. Using SPY++, I see the main window listed with no child controls, and a "WindowsFormsParkingWindow" which contains all the children for this form. The data on the controls is correct, but it's as if they are just not on the right form. 4) I also intended for a Windows Service to start the application, which works, but the application does not survive a user logoff. We have C++/MFC applications which do a subclassing code trick to accomplish this but I've not found an equivalent for C# apps. http://support.microsoft.com/kb/q164166/ 5) I have the main form's TopMost property set to true, and after 2 hrs. of messing around, I discovered the tooltips are showing behind the form. This is the case for XP as well as Win2k. One unrelated thing: 1) Once in a while my VS.NET search function starts reporting something like "no files found to search in". Strangely enough, when I press CTRL+SCROLL LOCK it starts working again. Not a big deal once you know the trick. I apologize if I've missed this information but I looked in the groups and didn't see any real answers to these questions. I would greatly appreciate any input as to whether some of this behavior falls in the category of "that's just the way it is", or I'm not doing things correctly, or bugs to be fixed, or need to look at workarounds. I'm using VS.NET 2003 and .NET Framework v1.1 and the target OS is Win2k. Needless to say, I've been frustrated to this point in creating what I "thought" to be a pretty simple app. My fear (from a schedule standpoint) is that I have to start over in C++. Thanks in advance for any comments or insults :- ). - Brad Jones (not CodeGuru guy!) Tag: Screen.WorkingArea Changed Event? Tag: 88074
  - 2
    - How to control the order in which individual child controls are rendered Hello All, I am creating an image browsing function within an application. As such, I created a Thumbpanel control (shown below) which displays a collection of thumbnails. Each thumbnail on that panel is also a custom control ( of a class called Thumbnail) placed at a calculated location on the Thumbpanel. It turns out to take 1+ seconds to construct and render each Thumbnail, so in turn it takes MANY seconds to render the whole panel. Therefore I need to force each Thumbnail to be rendered individually as they are constructed, so that the user will not be confused by the frozen screen awaiting the whole thing to render. I expected that the line: thumb.Refresh(); ... would force the thumb object (of type Thumbnail) to be rendered upon that call. But that didn't do the job. Can someone give my guidance on how to force rendering of the individual child controls (Thumbnails) in the order I specify? Thanks, -- Bruce ------------------------------------------- using System; using System.Collections; using System.ComponentModel; using System.Drawing; using System.Data; using System.Windows.Forms; namespace WTMWClient { /// <summary> /// Summary description for ThumbPanel. /// </summary> public class ThumbPanel : System.Windows.Forms.Control { Assets m_Assets; ArrayList m_Thumbnails; bool m_Scrollable = false; public delegate void ThumbPanelDoubleClickedHandler(object sender, ThumbnailDoubleClickedEventArgs e); public event ThumbPanelDoubleClickedHandler ThumbPanelDoubleClickedEvent; private System.ComponentModel.Container components = null; public ThumbPanel() { InitializeComponent(); m_Assets = new Assets(); // Simply a default value so it will not be null. m_Thumbnails = new ArrayList(); } protected override void Dispose( bool disposing ) { if( disposing ) { if( components != null ) components.Dispose(); } base.Dispose( disposing ); } ~ThumbPanel() { // ~base(); foreach (Thumbnail thumb in m_Thumbnails) { thumb.Dispose(); } } #region Component Designer generated code /// <summary> /// Required method for Designer support - do not modify /// the contents of this method with the code editor. /// </summary> private void InitializeComponent() { // // ThumbPanel // this.Dock = System.Windows.Forms.DockStyle.Fill; } #endregion protected override void OnPaint(PaintEventArgs pe) { // TODO: Add custom paint code here // Calling the base class OnPaint base.OnPaint(pe); } protected override void OnResize(EventArgs e) { base.OnResize (e); PlaceThumbnails( false ); } /// <summary> /// Place each thumbnail in its proper position. Assumption is that /// each thumbnail has already be constructed and placed in the /// m_Thumbnails collection before this call. /// </summary> protected void PlaceThumbnails( bool isFirstDrawOfThisSetOfThumnails ) { // Remove all the old ones. (But, dont "dispose" them, since they // are still instantiated and held in m_Thumbnails.) this.Controls.Clear(); // Place each one in proper position.... int x, y; x = y = 0; if ( isFirstDrawOfThisSetOfThumnails ) { m_Thumbnails.Clear(); Thumbnail thumb; foreach (Asset asset in m_Assets) { thumb = new Thumbnail( asset ); m_Thumbnails.Add( thumb ); thumb.ThumbnailDoubleClickedEvent += new WTMWClient.Thumbnail.ThumbnailDoubleClickedHandler( thumb_ThumbnailDoubleClickedEvent); thumb.Location = new Point(x, y); this.Controls.Add(thumb); thumb.Refresh(); // I expected this to force rendering here. No luck!! x += thumb.Width; if ( x > this.Width-thumb.Width ) { x = 0; y += thumb.Height; } } } else { // no need to instantiate individual Thumbnails in this case. // Rather, just grab each from the m_Thumbnails collection. foreach (Thumbnail thumb in m_Thumbnails) { thumb.Location = new Point(x, y); this.Controls.Add(thumb); x += thumb.Width; if ( x > this.Width-thumb.Width ) { x = 0; y += thumb.Height; } thumb.Refresh(); } } } /// <summary> /// Assign an Assets collection to be spanned via a set of thumbnails on the panel... /// </summary> public Assets AssetsSource { set { m_Assets = value; if (m_Assets.Count == 0) return; PlaceThumbnails( true ); } } // Property: AssetsSource protected void thumb_ThumbnailDoubleClickedEvent( object sender, ThumbnailDoubleClickedEventArgs e) { // MessageBox.Show( "clicked on: " + e.Asset.FileName ); if ( ThumbPanelDoubleClickedEvent != null) { ThumbPanelDoubleClickedEvent( sender, e ); } } } } Tag: Screen.WorkingArea Changed Event? Tag: 88072
  - 3
    - Webbrowser control Hi I have a form with a WebBrowser on it. when i load a webpage in it wich normally creates a new window for the clicked link i want this to show in a window i create. I can't find a way of how to get this done. Does anybody have a sample or a link to a sample in C# Greetings Andre Mens andre.mens@bennekens.nl Tag: Screen.WorkingArea Changed Event? Tag: 88071
  - 4
    - No clue why ShowDialog crashes.... This one has me completely baffled. I am calling ShowDialog on this form, and it is about the simplest form in any application. The form presents a multi-line text box for viewing, copying to clipboard, or printing. Maybe someone has ideas??? WoComMenuHandler is a context menu handler on the main form. WoComMenuHandler instances frmTextView, sets properties, and then calls frmTextView.ShowDialog and crashes as follows. There is no form load or activated event coded. WoComMenuHandler does this setup prior to ShowDialog sets properties, as follows: Dim frm As New frmTextEditor frm.Editable = True frm.DialogTitle = "WO " & WoNum.ToString & " Comments" frm.TextContent = wo.Comments If frm.ShowDialog(Me) = DialogResult.OK Then ... The properties (used above) in frmTextView are pretty straight forward. It doesn't crash setting these properties. It crashes on ShowDialog. Public Property Editable() As Boolean Get Return Not tbText.ReadOnly End Get Set(ByVal Value As Boolean) tbText.ReadOnly = Not Value If tbText.ReadOnly Then Me.btnOK.Text = "OK" Me.btnCancel.Visible = False Else Me.btnOK.Text = "SAVE" Me.btnCancel.Visible = True End If End Set End Property Public Property DialogTitle() As String Get Return Me.Text End Get Set(ByVal Value As String) Me.Text = Value End Set End Property Public Property TextContent() As String ' tbText is a multiline text box. Get Return tbText.Text End Get Set(ByVal Value As String) tbText.Text = Value tbText.SelectionLength = 0 End Set End Property The exception I see is as follows... ************** Exception Text ************** System.ArgumentException: Invalid parameter used. at System.Drawing.Bitmap..ctor(Int32 width, Int32 height, PixelFormat format) at System.Drawing.Bitmap..ctor(Int32 width, Int32 height) at System.Drawing.Icon.ToBitmap() at System.Windows.Forms.ThreadExceptionDialog..ctor(Exception t) at System.Windows.Forms.ThreadExceptionDialog..ctor(Exception t) at System.Windows.Forms.ThreadContext.OnThreadException(Exception t) at System.Windows.Forms.Control.WndProcException(Exception e) at System.Windows.Forms.ControlNativeWindow.OnThreadException(Exception e) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg) at System.Windows.Forms.ComponentManager.System.Windows.Forms.UnsafeNativeMethods+IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData) at System.Windows.Forms.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context) at System.Windows.Forms.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context) at System.Windows.Forms.Application.RunDialog(Form form) at System.Windows.Forms.Form.ShowDialog(IWin32Window owner) at PPSManager.frmMain.WoComMenuHandler(Object sender, EventArgs e) at System.Windows.Forms.MenuItem.OnClick(EventArgs e) at System.Windows.Forms.MenuItemData.Execute() at System.Windows.Forms.Command.Invoke() at System.Windows.Forms.Control.WmCommand(Message& m) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) Tag: Screen.WorkingArea Changed Event? Tag: 88069
  - 5
    - What direction to select? (Since this ng was flooded I repost this Q.) I declared a Form in Microsoft Visual Studio .NET 2003. On the form there are buttons and progression bars and three PictureBox in row, each showing a picture, later a movie. The three PictureBox should always occupy the available room when the form is resized (as much as reasonable) and if one of them is more interesting, I want to be able to size it larger covering the others. (A button press will size all of them back to the regular arrangement.) That is what I would like to do. (I could not find any examples yet.) Should I program windows instead of PictureBoxes or I should be able to use PictureBox? Would it be possible to display the short movies (20-40sec long each) in the PictureBox using a thread for each? Thank you for any guidance. Tag: Screen.WorkingArea Changed Event? Tag: 88068
  - 6
    - problems with multithreading, datasets and datagrids I have a method that fills a dataset. Iâ??m calling this method asynchronously using BeginInvoke. I put the dataset in an EventArgs derived class object and pass that to another method. This second method switches back to the UI thread and uses the data in the dataset to populate text boxes and datagrids in the main form. This always works fine the first time, and always freezes the app the second time. One of the datagrids Iâ??m populating this way is visible and it always gets a second scroll bar along the bottom the second time, it doesnâ??t get filled and the app freezes. Iâ??m thinking dataset corruption but Iâ??m not sure. When I change my asynchronous method call to a regular method call, everything works fine. I learned the technique I use from Chris Sellsâ?? article: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnforms/html/winforms01232003.asp I also own the book. Iâ??ve used this technique successfully in a scenario that does not involve dataset passing and datagrid loading. Any ideas? EventArgs derived class: public class VelocityArgs : EventArgs { internal BOOL Success; public DataSet Ds; internal VelocityArgs(){} internal VelocityArgs(BOOL success) { Success = success; } internal VelocityArgs(DataSet ds) { Ds = ds; } internal VelocityArgs(BOOL success, DataSet ds) { Success = success; Ds = ds; } } Delegates for the 2 methods: delegate void SnapDataDelegate(); delegate void PopTab_SnapDelegate(object sender, VelocityArgs v); The asynchronous call: private void btnRLSqlSnap_Click(object sender, System.EventArgs e) { if (velocity.SQLDataMgr.LoadState == velocity.LOADSTATE.DB_DATA) { // Asynch delegate method SnapDataDelegate snapDataDelegate = new SnapDataDelegate(SnapData); snapDataDelegate.BeginInvoke(null, null); // calling SnapData asynchronously //SnapData(); // no problems this way (not asynchronous) } } The method that is called asynchronously: private void SnapData() { object sender = System.Threading.Thread.CurrentThread; if (velocity.SQLDataMgr.LoadState == velocity.LOADSTATE.DB_DATA) velocity.SQLDataMgr.GetSQLSnap.Run(velocity.SQLDataMgr.Connection); velocity.SQLDataMgr.GetSQLSnap.LoadSpidStateHash(); VelocityArgs v = new VelocityArgs(velocity.SQLDataMgr.GetSQLSnap.GetDataSet); PopTab_Snap(sender, v); } PopTab_Snap switches back to the UI thread and populates the UI with the datasetâ??s data: private void PopTab_Snap(object sender, VelocityArgs v) { // Make sure we're on the right thread if (this.InvokeRequired == false) { // skipping code that populates the textboxes â?¦ DGR3Sessions.ColumnHeadersVisible = true; if (v.Ds.Tables.Contains("Table2")) { DGR3Sessions.DataSource = v.Ds.Tables["Table2"]; // freezes here SizeCol(DGR3Sessions, "Table2", dotSpace); } â?¦ } else // Transfer control to correct thread { PopTab_SnapDelegate popTab_Snap = new PopTab_SnapDelegate(PopTab_Snap); Invoke(popTab_Snap, new object[] { sender, v}); } } Tag: Screen.WorkingArea Changed Event? Tag: 88067
  - 7
    - TabPages hiding/showing changed in .NET Beta 2 or HOW ?? By now we all know it's a quite a job to hide/show tab pages on a tab control ... The workaround of adding (show) a removing (hide) pages to the tab control seems to now only be a nice dream that I once had ???? This still works fine in Beta 2 when the FORM that the tab control is on, is visible. However, if the form is hidden I cannot use this code anymore !!! I don't wan't to make a hidden form visible and then start manipulating the tab pages. Anyone know a new workaround Tag: Screen.WorkingArea Changed Event? Tag: 88066
  - 8
    - Bizarre keyup-events Hi. I've got this ListView with several items comparable to directories. Upon key-up of Keys.Enter, I do a showDialog() of a login form. Pressing enter on the login form (triggering its accept-button) also generates a key-event on the listview. Is this a bug or ... ? Thanks, Brecht Tag: Screen.WorkingArea Changed Event? Tag: 88065
  - 9
    - Datagrid Issue Hi, I have a datagrid that I want to have a row highlighted when the mouse click on any cell. I am able to accomplish it. But when I use the arrow keys to move the cursor up/down I don't heve any row highlighted. Basically I want to know what event is triggered when I move the up/down arrow keys so I can highltght record. Thanks for any help. Sean Tag: Screen.WorkingArea Changed Event? Tag: 88058
  - 10
    - decompression question Hi there I am using DeflateStream of System.IO.Compression to compress/decompress a file. The compression works (apparently) well, but I can't get to decompress it! I've tried everything, but the MSDN2 references use the MemoryStream which isn't very intuitive for me. Please help! Best regards Loane My code is given below: Imports System Imports System.IO Imports System.IO.Compression Public Class DeflateCompress Public Shared Sub Main() ' Names of original and compressed files Dim filename As String = "C:\test\original.txt" Dim filename_compressed As String = "C:\test\original.txt.zip" ' Open original (uncompressed) file as a filestream Dim infile As FileStream = New FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.Read) ' Attempt to read filestream Dim buffer(infile.Length - 1) As Byte Dim count As Integer = infile.Read(buffer, 0, buffer.Length) ' Close filestream infile.Close() ' Create new file to receive compressed stream Dim ms_comp_create As New FileStream(filename_compressed, FileMode.Create) ' Send stream of compressed data Dim compressedzipStream As New DeflateStream(ms_comp_create, CompressionMode.Compress, True) ' Write and close stream compressedzipStream.Write(buffer, 0, buffer.Length) compressedzipStream.Close() End Sub End Class Imports System Imports System.IO Imports System.IO.Compression Public Class DeflateDecompress Public Shared Sub Main() ' Define compressed and decompressed file names Dim strComp As String = "c:\test\compressed.txt" Dim strDecomp As String = "c:\test\decompressed.txt" ' Open compressed file and create a filestream Dim filComp As FileStream = New FileStream(strComp, FileMode.Open, FileAccess.Read, FileShare.Read) ' Create a byte array equal in length to the compressed file Dim bufComp(filComp.Length - 1) As Byte ' Read all bytes in the open file to the byte array filComp.Read(bufComp, 0, bufComp.Length) ' Create a filestream to deposit the decompressed stream Dim filDecomp As FileStream = New FileStream(strDecomp, FileMode.Create) ' Decompress the contents of the compressed file Dim zipStream As New DeflateStream(filComp, CompressionMode.Decompress) ' Create a byte array greater in length than the compressed file Dim bufDecomp(bufComp.Length + 100) As Byte ' Read compressed byte array into decompressed file Dim offset As Integer = 0 Dim totalcount As Integer = 0 While True Dim bytesRead As Integer = zipStream.Read(bufDecomp, offset, 100) If bytesRead = 0 Then Exit While End If offset += bytesRead totalCount += bytesRead End While ' Close the zipstream zipStream.Close() ' Close files filComp.Close() filDecomp.Close() End Sub End Class Tag: Screen.WorkingArea Changed Event? Tag: 88048
  - 11
    - DataGrid timestamp column NOTE: I absolutely understand that a SQL Timestamp datatype is not a Datetime. I've searched google, and the only hits are poor sods that want to convert a Timestamp to a Datetime. I want it to show as hex. When I've got a column in a DataGrid that's a Timestamp, it shows as "Byte[] Array" in the DataGrid. What do I have to do to get this column to show as a hex value like it does when I run a query in QA? I'm not finding anything I can hook to do this. Anyone? Tag: Screen.WorkingArea Changed Event? Tag: 88045
  - 12
    - MDI application multiple controlboxes visible I have a MDI application where the child forms have the controlbox property set to true, the forms open in normal state and autoscroll = true. When multiple such child forms are open and even if one of them is maximised and then when tries to move between the various open forms via the windowlist an orphan controlbox is visible on the mdi. As a result of which one can see multiple controlboxes even when one form is open. Kindly do help me with since I am having a terrible time with this. ----------------------- Posted by a user from .NET 247 (http://www.dotnet247.com/) <Id>qJVvNaqrn0WoMtI/XSpjDA==</Id> Tag: Screen.WorkingArea Changed Event? Tag: 88044
  - 13
    - Set time of time picker (Type your message here) I am using date time picker. I want to set the value of my choice in it . But not able to set the value of control. i hv set the property of SYSTEMTIME and send message DTM_SETSYSTEMTIME. what shud i do now Language evc++ -------------------------------- From: Neha yadav ----------------------- Posted by a user from .NET 247 (http://www.dotnet247.com/) <Id>ddOvH8rMQUO4H2zIlYth7w==</Id> Tag: Screen.WorkingArea Changed Event? Tag: 88043
  - 14
    - Help with MessageBox.Show in SDk 1.1 I have installed the latest SDK 1=2E1 from Microsoft on my PC= running Win2K OS=2E When I run the following program, it displays= the MessageBox BUT DOES NOT show any text or anything on the= button=2E I think it is supposed to dislay the text "Hello World!"= and OK on the button=2E Any help is greatly appreciated=2E Here is the code: /* =09HelloWorld=2Ecs - First c# program =09Compilation: csc HelloWorld=2Ecs */ using System; using System=2EWindows=2EForms; public class HelloWorld { =09public static void Main() =09{ =09=09//Print Hello World =09=09MessageBox=2EShow("Hello World !"); =09} } -------------------------------- From: mafat mafat ----------------------- Posted by a user from =2ENET 247 (http://www=2Edotnet247=2Ecom/) <Id>ER0meXW5Zk6777YqONKIzw=3D=3D</Id> Tag: Screen.WorkingArea Changed Event? Tag: 88042
  - 15
    - Problem due to DPI Changes Hi every One, The problem i am facing has been handled previously by Mr=2EMarkus= Wildgruber=2E The only difference was that he had used panels=2E My= problem is that i am not using panels and when the DPI is= changed the controls on the form get jumbled up=2E Can some body= please address my problem and help me with a solutions as soon= as possible=2E It did be good enough if i can see to that the changes caused due= to DPI dose not effect my applications and the settings of the= application remain stable=2E Kindly inform me about any such= property that controls the DPI changes=2E Thank you Vimal Adithya -------------------------------- From: Vimal Adithya ----------------------- Posted by a user from =2ENET 247 (http://www=2Edotnet247=2Ecom/) <Id>9z6ovZdkW0SgHKqBU1cGdA=3D=3D</Id> Tag: Screen.WorkingArea Changed Event? Tag: 88041
  - 16
    - setting icon when scrolling through applications using alt+tab Hi there I am using a fixed-dialog windows form since I don't want an icon to be displayed, either on the form itself or on the task bar or status areas. However, when I scroll through the running applications using Alt + Tab, I get the generic executable icon. Can I change this to a custom icon? Best regards Loane Tag: Screen.WorkingArea Changed Event? Tag: 88039
  - 17
    - Cannot access a disposed object named "DropDownHolder" I have an application which uses the .Net PropertyGrid control. I haven't encountered any special issues when running the application from the VS IDE. However, users of the application hit several times (but seldom) the following exception: Message(s): Cannot access a disposed object named "DropDownHolder". Object name: "DropDownHolder". Some more details: The PropertyGrid is filled via a PropertyBag object (see http://www.codeproject.com/cs/miscctrl/bending_property.asp) and the application uses a DropDown converter to feed items with DropDown lists of strings to the PropertyBag. These exceptions happened after the main form of the application, which contains the PropertyGrid control, was hidden for some time and then was shown again and a dropdown item was clicked. I failed to reproduce this under the IDE. I basically understand what this exception means. However, I do not understand what can be the reason for this exception. The Call Stack of the exception follows below. Any explanation why this happens and a suggestion for a workaround are most welcome. -- Benzi System.ObjectDisposedException: Cannot access a disposed object named "DropDownHolder". Object name: "DropDownHolder". at System.Windows.Forms.Control.CreateHandle() at System.Windows.Forms.Form.CreateHandle() at System.Windows.Forms.Control.get_Handle() at System.Windows.Forms.PropertyGridInternal.PropertyGridView.DropDownControl(Control ctl) at System.Windows.Forms.PropertyGridInternal.PropertyGridView.PopupDialog(Int32 row) at System.Windows.Forms.PropertyGridInternal.PropertyGridView.OnBtnClick(Object sender, EventArgs e) at System.Windows.Forms.Control.OnClick(EventArgs e) at System.Windows.Forms.Button.OnClick(EventArgs e) at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent) at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ButtonBase.WndProc(Message& m) at System.Windows.Forms.Button.WndProc(Message& m) at System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) Tag: Screen.WorkingArea Changed Event? Tag: 88033
  - 18
    - 'Reference error' on second attempt to inherit form from DLL Using C#.NET.2003 I'm running into a problem attempting to put wrapper classes around managed Forms, and after six hours it's getting hard to see whether it's a bug, bad documentation, or my failure to understand the documentation. Any advice -- or comments that can narrow my choices -- will be appreciated. I'm writing a multi-form application whose form inheritance structure I've already tried to lay out four or five times. Since re-doing it is a real pain in the asterisk, I'd like to be able to subclass the .NET managed Forms class several deep to cut down on the time this takes to do. Unfortunately, with my Latest'n'Greatest(tm) approach I keep running into the following error message: Reference error: Unable to reference 'MyDLL' to the current application. Check that a different version of 'MyDLL' is not already referenced. Here's what I've tried to do: In the MyDLL project I have: class MyBaseForm : System.Windows.Forms.Form class MyDbAccessForm: MyDLL.MyBaseForm On this form I added a DataSet, an OleDbConnection, and several DataAdapters. Both of these are simple "wrapper" classes whose only purpose is to leave a place for me to add changes later on as required. I then tried creating a form frmMyMainForm in the MyApp project by right-clicking on the project in Solutions Explorer and selecting the Add->Inherited_Form option. When asked which reference I wanted to add, I selected 'MyBaseForm' in 'MyDLL'. So far, so good. The MyApp project now has a Reference entry pointing it at MyDLL. Then I attempt to add a second form -- frmMyDbBrowse -- to the MyApp project using the same approach. Add->Inherited_Form, select the 'MyDbAccessForm' in 'MyDLL' as its ancestor, and... BOOM! A 'Reference error' message. There seem to be very few reports of this particular error message, and since I'm not attempting to inherit from an EXE file <grin> those I've found don't appear to apply here. Does anyone have any idea why this might be happening? I'm fairly new to .NET, so there's lots of room for a Probable User error; if so, can anyone suggest where I might be stumbling? Frank McKenney, McKenney Associates Richmond, Virginia / (804) 320-4887 Munged E-mail: frank uscore mckenney ayut minds pring dawt cahm (y'all) -- Definition of an Upgrade: Take old bugs out, put new ones in. -- Tag: Screen.WorkingArea Changed Event? Tag: 88032
  - 19
    - Which way to go? I declared a Form in Microsoft Visual Studio .NET 2003. On the form there are buttons and progression bars and three PictureBox in row, each showing a picture, later a movie. The three PictureBox should always occupy the available room when the form is resized (as much as reasonable) and if one of them is more interesting, I want to be able to size it larger covering the others. (A button press will size all of them back to the regular arrangement.) That is what I would like to do. (I could not find any examples yet.) Should I program windows instead of PictureBoxes or I should be able to use PictureBox? Would it be possible to display the short movies (20-40sec long each) in the PictureBox using a thread for each? Thank you for any guidance. Tag: Screen.WorkingArea Changed Event? Tag: 88025
  - 20
    - Error removing last item from a ListBox I'm have a sample form, with a ListBox and a Remove button, I'm doing data binding to a custom collection, everything is working find, I can bind the list box, I can see the items appear on the list, I can remove items from the list, BUT my problem is when I attempt to remove the last item on the list, I get the following error: System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values. Parameter name: Index was out of range. Must be non-negative and less than the size of the collection at System.Collections.CollectionBase.System.Collections.IList.get_Item(Int32 index) at System.Windows.Forms.CurrencyManager.EndCurrentEdit() at System.Windows.Forms.CurrencyManager.ChangeRecordState(Int32 newPosition, Boolean validating, Boolean endCurrentEdit, Boolean firePositionChange, Boolean pullData) at System.Windows.Forms.CurrencyManager.set_Position(Int32 value) at System.Windows.Forms.ListBox.OnSelectedIndexChanged(EventArgs e) at System.Windows.Forms.ListBox.WmReflectCommand(Message& m) at System.Windows.Forms.ListBox.WndProc(Message& m) at System.Windows.Forms.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam) This is the source code I'm using (C#): Collection.cs public class Collection : System.Collections.CollectionBase { private Collection() { } public static Collection NewCollection() { return new Collection(); } public void Remove(CollectionItem item) { if (this.List.Contains(item)) this.List.Remove(item); } public int Add(string displayText, string valueText) { return this.List.Add(CollectionItem.NewCollectionItem(displayText, valueText)); } public CollectionItem this[int index] { get{return (CollectionItem)this.List[index];} } } CollectionItem.cs public class CollectionItem { private string _displayText = string.Empty; private string _valueText = string.Empty; public string DisplayText { get{return this._displayText;} set{this._displayText = value;} } public string ValueText { get{return this._valueText;} set{this._valueText = value;} } private CollectionItem(string displayText, string valueText) { this._displayText = displayText; this._valueText = valueText; } public static CollectionItem NewCollectionItem(string displayText, string valueText) { return new CollectionItem(displayText, valueText); } } Form code: public class Form1 : System.Windows.Forms.Form { private System.Windows.Forms.ListBox lisItems; private Collection items = Collection.NewCollection(); public Form1() { // // Required for Windows Form Designer support // InitializeComponent(); items.Add("One", "1"); items.Add("Two", "2"); items.Add("Three", "3"); this.lisItems.DataSource = items; this.lisItems.DisplayMember = "DisplayText"; this.lisItems.ValueMember = "ValueText"; } private void btnRemove_Click(object sender, System.EventArgs e) { if (this.lisItems.SelectedItem == null) return; CollectionItem item = (CollectionItem)this.lisItems.SelectedItem; this.lisItems.SuspendLayout(); this.lisItems.DataSource = null; items.Remove(item); this.lisItems.DataSource = items; this.lisItems.DisplayMember = "DisplayText"; this.lisItems.ValueMember = "ValueText"; this.lisItems.ResumeLayout(); } } NOTE: I just paste the relevant code! Upon clicking the Remove button, I'm removing the selected item from the collection and re-binding the collection. I can remove any element, BUT ONLY THE LAST ONE GIVES ME THE ERROR. Thanks in advance for your help Tag: Screen.WorkingArea Changed Event? Tag: 88024
  - 21
    - Again Winform Datagrid: Individual row height and Vertical Scrollbar Hi, We are using Windows.Forms.DataGrid control in our application. Let me explain what i have done so far so it will easy to understand the problem: We have used DataGridIconColumnStyle for one icon column and second is DataGridTextBoxColumn for some other purpose In second column i am showing Comboboxes when user clicks on it directly. Now when user clicks on first column's icon, we are showing a big panel in second column in the same row where we had Combobox previously. On click on first column's icon image, big panel with some info shows in second column's place. And at that time we are changing row height and it changes the row height for that perticular row. Up to this, it works fine. Now when second column shows panel in one cell with height changed, a vertical scroll bar appears. But when i click on scrollbar to scroll downside, it scrolls whole first column which has double height than total height of all other rows with default height. So problem is: 1. When i scroll down, it is not scrolling as per total height but it scrolls up the whole first row in one stroke wich has very big height. 2. When it scrolls up the first row with big height value, it is not scrolling up whole panel that i have put in the second column. It scrolls up by just default row size. So, what i want to do is: 1. Smooth scrolling of the vertical scroll bar 2. And with scrolling of datagrid rows, the panel should scroll also. Before you write any comment, please have a look at the following lines, 1. I have searched all the relavant messages in the private and public newsgroups but could not find the solution. 2. In most of the posts they have individual row height change problem which we have done, so we have a problem of scrolling after changed height. 3. I have also searched many forums online and using google also. But i could not find any solution so please do not point me out that look at similar posts that has been posted previously. I hope, i will get reasonable answer from you all experts as well as MSFT engineers. I hope to see some good pointers, idea, or trick to solve my problems. You are most welcome for further clarification if you feel so. Thanks in Advance. Regards, Mahesh Devjibhai Dhola Tag: Screen.WorkingArea Changed Event? Tag: 88023
  - 22
    - download file while showing progress bar Hi there I'm attempting to download a file from our server programmatically using an internet connection. Ordinarily I would use WebClient.DownloadFile() but I would like to show a progress bar during the download. The code is given below. Any ideas why it fails? Best regards Loane [Other info: "pbr" is a progress bar initiated earlier in the code] Dim fs_App As FileStream = New FileStream("C:\mainapp.zip", FileMode.Create) datBuffer = New Byte(1023) {} Dim reqSync_App As WebRequest = WebRequest.Create("http://www.123.com/mainapp.zip") Dim respSync_App As WebResponse = reqSync_App.GetResponse() Dim strm_App As Stream = respSync_App.GetResponseStream() Dim len_App As Double Dim total, cnt_App As Integer While total < pbrSync.Maximum cnt_App = strm_App.Read(datBuffer, 0, 1024) If cnt_App <= 0 Then Exit While fs_App.Write(datBuffer, 0, cnt_App) total += cnt_App If total < pbrSync.Maximum Then pbrSync.Value = total lblInfo7b.Text = "Downloading application file ... (" & (total/1024).ToString("#,##0") & "KB of " & (pbrSync.Maximum/1024).ToString("#,##0") & "KB) (" & ((total/1024)/(pbrSync.Maximum/1024)*100).ToString("##0") & "%)" Application.DoEvents() End While respSync_App.Close() strm_App.Close() fs_App.Close() Tag: Screen.WorkingArea Changed Event? Tag: 88019
  - 23
    - Problem with form sizing Hi I got an VB.NET 2003 App with an MDI form and 4 child forms, designed for 780x1024. This applications is distributed world wide, but 2 users complain that they cannot see the full screen, or even with the scrollbars they are not able to scroll to the hidden areas. They use WINDOWS 2000 pro, Traditional Chinese Others are using Windows 2000 Pro Chinese Simple, and have no problems Forms borderstyle = Sizable AutoScroll=true Any hint where to look about at this issue is welcome. Jens.. Tag: Screen.WorkingArea Changed Event? Tag: 88012
  - 24
    - Custom Collection "Display Name" I have a custom collection(which inherits from the collectionbase and implements ibindinglist) with various properties like DateOfSale, DateOfPayment etc... When I bind to a grid for example I want the header to display Sale Date and Payment Date. Is there a way to handle that in the custom collection?? Specifically is there an attribute that i can set?? -- Message posted via http://www.dotnetmonster.com Tag: Screen.WorkingArea Changed Event? Tag: 88009
  - 25
    - Quest: Setting Dlg Forms' OK & Cancel Buttons Correctly... I have two modal dlg forms that are invoked(seperately) by a main form but the two modal dlg forms don't close when clicking the OK & Cancel buttons setup as below... Here the setup... //In MainForm.cs... //I Don't want the main form to close with enter and esc keys... MainForm.AcceptButton = None; //Not in code... MainForm.CancelButton = None; //Not in code... //I use ExitApp button to exit app... ... void ExitApp_Click(...) { Close(); } //In My1stDlgForm.cs... //I Do want the main form to close with enter and esc keys... OKDlgButton.DialogResults = ....OK; CancelDlgButton.DialogResults = ....Cancel; ... My1stDlgForm.AcceptButton = OKDlgButton; My1stDlgForm.CancelButton = CancelDlgButton; //In My2ndDlgForm.cs... //I Only want the form to close with enter keys... OKDlgButton.DialogResults = ....OK; ... My2ndDlgForm.AcceptButton = OKDlgButton; My2ndDlgForm.CancelButton = ...None; Note: End of codes above... The program builds and runs but doesn't close. I have other C# programs that the button worked and check the codes above with the old program an everything matchs up... Where else do I look to set this up... Any help... Tag: Screen.WorkingArea Changed Event? Tag: 88008

Hi all,

First the question:
Is there a way to be notified when the WorkingArea of the Screen
changes? (for example, the taskbar is moved from bottom to left of
desktop)

Here are the details of the problem if you are interested.

I have a form where I set the Region property. Everything works fine
until you move the TaskBar to the left or top of the desktop. This
then skews my Region's location and it appears incorrectly.

The problem is caused when I translate my Region to the screen
coordinates (using PointToScreen and Region.Translate). If the taskbar
is on the left or top, the region gets "pushed" to the right or bottom.
However, this position is incorrect. I solved the issue by offsetting
the region location using Screen.WorkingArea's x and y values.

Then I ran into a performance problem. I have to recalculate the
region quite a bit and it caused a performance issue. I was using
Screen.FromControl() everytime I was recalculating the region (My
application must support multiple monitors) and I believe this was the
culprit.

I have worked around the issue by caching the working area myself and
testing if my Form moves from one monitor to the other via the
LocationChanged event.

The only problem is I need to know when the WorkingArea changes so I
can update my cached workingArea and also re-translate my region.

TIA
Cole

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Re: Screen.WorkingArea Changed Event? by Armin

Armin
Wed May 18 12:47:10 CDT 2005

"scolemann" <scolemann@yahoo.com> schrieb
>
> First the question:
> Is there a way to be notified when the WorkingArea of the Screen
> changes? (for example, the taskbar is moved from bottom to left of
> desktop)

Handle the event Microsoft.Win32.SystemEvents.UserPreferenceChanged.
e.Category will be Microsoft.Win32.UserPreferenceCategory.Desktop

Armin

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Re: Screen.WorkingArea Changed Event? by scolemann

scolemann
Wed May 18 13:07:30 CDT 2005

Armin,

Thank You! That worked perfectly.

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