DataGrid Updating DataSource

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  - 1
    - app.config I have a solution with 2 projects: a class library(my.dll) + a windows application (mine.exe). In exe project I have a reference to the dll. In both I have app.config files, BUT only mine.exe.config file is generated in \bin\Debug\ folder of exe app. What can I do to generate my.dll.config from app.config ? Thnx for any advice. Tag: DataGrid Updating DataSource Tag: 54768
  - 2
    - How do I enable Add button in custom collection editor? Hi all. I am developing PropertyGrid runtime support for a custom class. One of my attributes in this class is an ArrayList that holds instances of another custom class. I have derived a custom collection editor for this list attribute. When this collection editor is invoked, it does display the correct caption which I assume means it knows the type of objects it is managing. My problem is the Add/Remove buttons are still disabled. From all the research I have done, I believe it is necessary for me to derive this custom collection editor because I am not working with a collection that provides access to an Item attribute for type discovery, right? I have no further enhancements that need to be made to this collection editor, so do I need to be overriding the EditValue method? If so, what should my implementation of EditValue be doing? Also, I do not have a custom TypeConverter written for the EmbeddedObject type. Is this a problem? If anyone out there can help me, I would be more than grateful. As it sits right now, I am as clueless as top management at a software design conference when it comes to collection editors. MSDN is of no help. There are a few article for the picking out there, but none explain the inner workings of the CollectionEditor in any detail. If anyone can point be to some good articles, I would love to see them. I feel like if I could better understand the CollectionEditor class, I might not be as clueless when trying to use them in real world scenarios. Thanks in advance! Casey Chester MIS Director Hirschfeld Steel Co., Inc. public class BrowsableObject { ... ... [Editor(typeof(EmbeddedObjectCollectionEditor), typeof(UITypeEditor))] public ArrayList EmbeddedObjectList { get{ return embeddedObjectList; } } ... ... } public class EmbeddedObjectCollectionEditor : CollectionEditor { public EmbeddedObjectCollectionEditor() : base(typeof(EmbeddedObject)) { } protected override Type[] CreateNewItemTypes() { return new Type[] { typeof(EmbeddedObject) }; } protected override Type CreateCollectionItemType() { return typeof(ProjectPolicy); } public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value) { // // If custom implementation is required, what should it be??? // return base.EditValue (context, provider, value); } } Tag: DataGrid Updating DataSource Tag: 54766
  - 3
    - NullReferenceException NullReferenceException? I receive this exception when i run my application: ******** Begin Exception ******** "System.NullReferenceException: Object reference not set to an instance of an object. 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.Run(Form mainForm) at CO.Win.MainModule.Main() in C:\CODev\Utveckling\CO\CO.Win\Main.vb:line 128" ******** End Exception ******** It's impossible to find out where in my code its been fired. I've got try-catch statements everywhere but the exception appears only in my main module: try . . Application.Run(startForm) Catch ex As System.NullReferenceException End try There is a datagrid on my form. Thanks in advanced! Tag: DataGrid Updating DataSource Tag: 54762
  - 4
    - How can I do that: Datagrid and textboxes? Hello all. So, I have some textboxes (txtName, txtAddress,txtCity,etc) in a form and a datagrid (grdCustomers) populate of a customers data table. I need this: after I populate (fill) the datagrid, the user click the datagrid row who´s selected, make an search in the database, if necessary, and the customer data appears in the respective textboxes.´ Am I clear? Well, I hope so. I´m use C#. Please, help me and sorry my poor English. Fernando Lopes Brazil. Tag: DataGrid Updating DataSource Tag: 54759
  - 5
    - ListBox within TextBox / CodeCompletion Hello out there, lang: csharp topic: ListBox in RichTextBox / sql / db / editors i am developing an sqlclientshellsystem, that makes it possible to connect to various sqlservers ( ms sqlserver, oracle, db2, ... ). Basic functionality is completed. Now i want to implement wordcompletion for different things: for example, if a user types in a tablename in order to specifiy the columns, i want to suggest the columns to him in form of a listbox popping up beneath the tablename. ( like it is known in many IDEs ( Codecompletion or Intellisense ). I know that i have to maintain keword database, schema information and a like. The problem is, how do i put a listbox into a textbox ?? i tried to TextBox.Controls.Add( ListBox ), but it doesn't have the wanted effect. Any hints ? ( I'm relatively new to .NET and haven't studied the ComponentModel yet, but perhaps you might tell me how i can accomplish my task ) Greetings and thanks in advance. Ole Viaud-Murat Tag: DataGrid Updating DataSource Tag: 54755
  - 6
    - How to disable the Windows form? Dear Friends, How to disable the Windows form? In VB6.0 Form1.Visiable = false; is there equivalent in VC# if so, how do to this? I need continuously running the form. Thanks, Joe Tag: DataGrid Updating DataSource Tag: 54744
  - 7
    - Datagrid navigation I have a datagrid bound to a datatable that has two relations defined on it. I enabled the 'AllowNavigation' so that I have that little '+' sign to navigate to child records. I wish I could disable one of the relations to be shown when I click on that '+' sign. Tag: DataGrid Updating DataSource Tag: 54740
  - 8
    - Initially focused control Hi! I designed a windows forms dialog with some controls on it. When it loads I want to set the control that has the input focus when the form is displayed. Somehow calling the Focus()-method of the control that I want to have focus in the Form.Load-Eventhandler does not work. Does anyone know a solution? TIA, Markus -- ########################################## Please do not send replies to msdngroups@syska.de. Mails sent to that adress will be deleted without being read. Tag: DataGrid Updating DataSource Tag: 54730
  - 9
    - DataBinding DataSet PrimaryKey Hi, I have a Strongly typed DataSet with a Primarykey which Iam binding to a textbox control on the windows form. In order to create a new row, iam creating a new Data row with dummy values. Up to now everything ok. But, once I change the primary key textbox value on the UI, the same is not reflected in the DataSet. I even tried EndCurrentEdit(). How to reflect the change in the DataSet?? Regards, Srikanth. Tag: DataGrid Updating DataSource Tag: 54723
  - 10
    - LVM_SETINSERTMARK message in .NET Hi: Anybody knows how to use insertion point in ListView in .NET? the message in Win32 is LVM_SETINSERTMARK, but i donno how to use it. Is there any good listview component other than windows'? Thanks Tag: DataGrid Updating DataSource Tag: 54717
  - 11
    - Evalute String If I have a string such as "1=1" or "True And False And True Or True", for example, is there a way in VB.Net to evaluate this into a true or false boolean? I have been using the script COM control with the Eval statement to do this, but is there a way to do this purely in .Net? Maybe using reflection or some other technology? Derek Tag: DataGrid Updating DataSource Tag: 54714
  - 12
    - MainMenu and MenuItems Hello, I am developing a security component for a windows forms application for my company. I want to be able to apply security to MainMenu objects and their associated MenuItems using a generic function. My problem is that I cannot seem to get access to the collection of MainMenu objects on any given form. I generally have 2 or 3 MainMenu objects on each form. However, I can only can access to the one that is currently set as the Form's Menu object using the Menu property of the form. How can I do this??? Please help ??? regards, Felicity Tag: DataGrid Updating DataSource Tag: 54711
  - 13
    - How to size the form onOpen Hi, I would like to open the form with the maximum amount of screen available without setting it to maximized. In other words, I would need to know what is the resolution of the screen to properly resize the window to fill the screen. I was thinking in using the win32 api "GetDeviceCaps" and figure the resolution this way. Is there another way to do it with the .NET FRAMEWORK? Thank you, Ernesto Tag: DataGrid Updating DataSource Tag: 54709
  - 14
    - Request for book recommendations Anyone know of any books that tell you how to do cool stuff with Windows applications? I'm talking things like: How to make your interface look like Microsoft Money. How to make your application run like Outlook. How to make your windows dock like Visual Studio. How to make controls slide across your screen when you click on something. I don't care about the "this is how you add a menu to the form" stuff. Any suggestions are welcome. Thanks! Tag: DataGrid Updating DataSource Tag: 54707
  - 15
    - Selecting field from DataGrid when using a Context Menu I created a context menu and bound it to the data grid this.dataGrid1.ContextMenu = this.contextMenu1; This works fine when I right click. What I am trying to do is to capture the data that is in the specific DataGrid box that the context menu was created on. I am then going to pass it to another winform. The functionality that I am looking for is if you left click on some code in Visual Studio and then right click and select copy. Do a paste somewere else . Whatever line you were on was selected for the copy. Any thoughts would be appreciated. Dave DavidElliott@BellSouth.net Tag: DataGrid Updating DataSource Tag: 54706
  - 16
    - Drag/Drop question I have an MDI app where I'm trying to drag things from one MDI child to another. The problem is that the drop target never gets any event notifications because it never has the focus. What I'd like to do is drag over this item, and then when the mouse moves over it, give it the focus. But I can't figure out any way to have the MDI parent handle MouseMove events. Is there a better way? Thanks Tag: DataGrid Updating DataSource Tag: 54705
  - 17
    - Thread Question -=> System.NullReferenceException after exiting main() I have created an application that will dynamically load other DLLs (plugins). The new plugin is a winform with an embedded IE Browser. I am wanting to have the form to run in its own thread. This would allow for other plugins and the main application to be free to do other work. I have written a little TestDriver for the plugin and am having some difficulty. If I don't use threads everything works just fine. If I do use threads, upon finishing the thread.Join() loop, I step to the end of main and I receive the same exception 3 times. Any help would be appreciated. Dave DavidElliott@Bellsouth.net ============================================================= An unhandled exception of type 'System.NullReferenceException' occurred in system.windows.forms.dll Additional information: Object reference not set to an instance of an object. ============================================================================== [STAThread] static void Main() { IPlugIn plugin = null; Assembly assembly = null; Object obj = null; String s = null; Thread thr = null; try { assembly = Assembly.LoadFrom("..\\..\\..\\bin\\Debug\\AJB.dll"); Type[] types = assembly.GetExportedTypes( ); foreach (Type t in types ) { Type interfaceT = t.GetInterface( "IPlugIn" ); if( null != interfaceT ) { plugin = (IPlugIn)assembly.CreateInstance(t.ToString()); obj = assembly.CreateInstance(t.FullName); s = obj.GetType().ToString(); plugin.PluginID = 74; thr = new Thread( new ThreadStart(plugin.Execute) ); thr.ApartmentState = ApartmentState.STA; thr.IsBackground = false; thr.Start(); //plugin.Execute(); } } } catch (Exception e) { s = Application.ExecutablePath.ToString() + "\n" + e.ToString() + e.Message + e.StackTrace; MessageBox.Show(s, "ExecutePlugin() Error"); } thr.Join(); } Tag: DataGrid Updating DataSource Tag: 54703
  - 18
    - Unable to delete controls. Hi, For some reason I appear to have lost the ability to delete controls in the designer (VS.net 2003) When I right click on any control all the options are blanked out apart from 'View Code' at the top. The Del key doesn't work either. I can still drag controls around the form but deleting them is impossible. I don't really want to go hack out all the definitions from the code... Any ideas? Thanks, Russ Tag: DataGrid Updating DataSource Tag: 54702
  - 19
    - Form, CancelButton, Escape, prevent Form close Hi, I have a form that has a Close button. I set this close button to be the CancelButton for my form. When the close button is pressed, if there have been any changes made to the form, I popup a MessageBox asking the user if they wish to save their changes, using the YesNoCancel message buttons. If the user hits cancel obviously I do not want to close the form. If the user hits close I call Close on the form. This works fine for when the user clicks the close button, but when they hit escape the form closes whether they hit cancel and I call Close or not. How can I get around this? I've pasted code sample below. Thanks, Adam private void bClose_Click(object sender, System.EventArgs e) { FormClose(); } protected virtual void FormClose() { bool close = true; if (myDataPanel.HasChanges()) { DialogResult dr = UIHelperController.Instance.ShowQuestionMessageBox(this,"Changes Made","Changes have been made to this panel. Would you like to save these changes before closing?",MessageBoxButtons.YesNoCancel); switch (dr) { case DialogResult.Yes: close = myDataPanel.Write(); break; case DialogResult.No: close = true; break; case DialogResult.Cancel: close = false; break; } } if (close) { Close(); } } Tag: DataGrid Updating DataSource Tag: 54701
  - 20
    - System.Threading.ThreadStateException I have a form with a grid. When a user selects some text in the Grid and presses Ctrl-C to copy the text, .NET throws an Exception with the description: "The current thread must set to Single Thread Apartment (STA) mode before OLE calls can be made. Ensure that your Main function has STAThreadAttribute marked on it." However, I already have System::Threading::Thread::CurrentThread->ApartmentState = System::Threading::ApartmentState::STA; in my _tWinMain. Thanks for any suggestions, Bumbrlik Tag: DataGrid Updating DataSource Tag: 54700
  - 21
    - Printer Settings Dialog?? Is there a way to directly access the printer settings dialog which is normally available by clicking the "Properties..." button on the PrintDialog? Tag: DataGrid Updating DataSource Tag: 54698
  - 22
    - Is there a simple way to change the DateTimePicker style. It looks sloppy. I want to use the DateTimePicker, so the user can pick the date from the calendar. Is there a way to choose a different calendar style? I see that I can change some colors, but what I do not like most is the red kind-of circle that circles the current date. The control looks sloppy and non-professional. Is there a simple way to clean it up? Thanks... Tag: DataGrid Updating DataSource Tag: 54697
  - 23
    - How-to create user control replacing main application form Hello all, I'm wading my way into .net by writing some custom controls. I would like to provide a parent class to these controls to give them easy access to common information. Initially tried this as a panel, but find that I can't drop non-visual components onto panels (they fall through to the main form). So now I am wondering is it possible to override the main application form with a user-authored form? I tried to do this by inheriting from System.Windows.Forms.Form, but when I instantiate such a control in the IDE, it actually appears to spawn a new thread consisting of an independent windows form which can't be accessed using the normal designer interface. Unrelated question - anyone know of a good online reference on Attributes? Thanks, Markus Tag: DataGrid Updating DataSource Tag: 54692
  - 24
    - Select row in datagrid I would like to find a row in datagrid with criteria and show the part of datagrid with the row selected Thanks for help Tag: DataGrid Updating DataSource Tag: 54691
  - 25
    - Simple problem with the AxWebBrowser control Hello, I am using a AxWebBrowser control in a VB.net windows form. In the form, I also have a TextBox where the user enters the URL he would like to navigate to. I want the TextBox to change it's display (to reflect the new page address) when the user clicks on an hyperlink on the web page (like in Internet Explorer). I have been looking at the events and methods of the AxWebBrowser object, and I can't find it! Any help on this would be very appreciated. thanks, Ross Tag: DataGrid Updating DataSource Tag: 54690
- Next
  - 1
    - Using Control.Invoke I want to programatically invoke a KeyDown event to a control that has the focus. Maybe you guys know a better way to do this anyway. In my MainMenu I have an Edit sub-menu that has Copy and Paste items. Each of these menu items I setup to use the Shortcut keys Ctrl+C and Ctrl+V. However, I want the Form window that is handling the main menu messages to be stupid about it and just notify the ActiveControl of a KeyDown event to let the controls handle copying to the Clipboard themselves. Going with this scenario how, in C#, do I invoke a KeyDown event to another control programatically? Or is there a better way to notify the ActiveControl? I've tried the following, but I get a compiler error. ActiveControl.Invoke( KeyDown, this, new KeyEventArgs (Keys.Control|Keys.C)); Thanks for your help, Aaron Tag: DataGrid Updating DataSource Tag: 54686
  - 2
    - Child Form Enter Event Fires Twice Can someone please tell me why a child form event fires twice? I've got an MDI windows app (C#) that has several child forms that a user can select via an Infragistics tab strip. Axe Tag: DataGrid Updating DataSource Tag: 54679
  - 3
    - Master-Detail DataGrids / WEB Services I have a form with 2 grids that participate in a master- detail relationship. I have a web service that supplies the dataset which populates the grids. The following code works great to load the data into the grids: Private Sub LoadGrids() 'instantiate the web services dim oWebService as new uwEngine.uwEngineServices 'call the GetListData service uwData = oWebService.GetListData() 'bind to the dgLists datagrid dgLists.DataSource = uwData dgLists.DataMember = "UW_LISTS" 'bind to the dgListValues datagrid dgListValues.DataSource = uwData dgListValues.DataMember="UW_LISTS.UW_LISTSUW_LISTS_DATA" End Sub Now I need the ability to trap the datatable events (columnChanging, rowChanging, etc). How do I create code to handle the events being that I am not dimming the datatables in my client code ? (the datatables are coming from the Web Service) thanks for your time Tag: DataGrid Updating DataSource Tag: 54667
  - 4
    - how to check if a form is already open Hi, How do I check that a form is already open? I think I have to check how many instances of that form class are initiated, but how do I do that? Thanks, Rainer. Tag: DataGrid Updating DataSource Tag: 54665
  - 5
    - .NET thin client I want to develop a "thin client" using C#. The idea is that most possible information to dynamically create and show forms comes from a server. Dynamic data to be shown on these forms should also come from a server. The forms must contain many windows controls (user controls) which are not statically known by the client assembly (preferably). I think that using aspx is not a good solution due to the poor user interface without complex scripts to show the controls. I want to use web services both for loading info to create the forms and for accessing dynamic data to be shown in the forms. Is this at all practical ? (due to bad performance, caching would help), anyone has an idea about architecture, formats etc Tag: DataGrid Updating DataSource Tag: 54662
  - 6
    - Shaped Form (TransparencyKey) problem on some installations Hi I have been using the combination of the BackgroundImage and TransparencyKey properties of a form in order to create an interesting splash screen. This is working on some machines but not others (All Windows XP). Is anyone out there aware of any problems regarding shaped forms at any framework release? Thanks in advance Andrew Wiles Tag: DataGrid Updating DataSource Tag: 54644
  - 7
    - DataBinding a RadioButton group Hi, I have two RadioButtons in a GroupBox. I want to databind these radiobuttons with a value (if '0', one radiobutton is checked else another) of a column in a DataTable. Iam not able to figure out how to do this. Please someone help me. Regards, Srikanth. Tag: DataGrid Updating DataSource Tag: 54641
  - 8
    - DropDownList with toolbar Is it possible to add a DropDownList to the ToolBar? I know there is a DropDownButton but it doesn't display a drop down list. Instead it displays a ContextMenu under a regular button. Tag: DataGrid Updating DataSource Tag: 54636
  - 9
    - Winform Memory Usage Hi, I created a fairly large data winforms applications and have deployed it on a terminal server. Every instance of the application, when executed on the terminal server, seems to take about 100 megs of memory. Can someone please give me some suggestions on how to minimize memory usage or share the application on the terminal server between users? Tag: DataGrid Updating DataSource Tag: 54634
  - 10
    - CheckBox (help!) This is a multi-part message in MIME format. ------=_NextPart_000_0041_01C365A0.FDA46CD0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello all, In Design-Time I created a form with many checkboxes which contained no = "text". It looked something like this: -------------------------------------------------------------------------= ----- mycheckboxes: 0 0 0 0 0 mycheckboxes2: 0 0 0 0 0 -------------------------------------------------------------------------= ----- where "0" is a checkbox. The problem I am having in Run-Time is that I = cannot see the focus on these checkboxes unless there is text on it. Is = there a way I can Override the focus from "text" to the control itself? Yama ------=_NextPart_000_0041_01C365A0.FDA46CD0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=3DContent-Type content=3D"text/html; = charset=3Diso-8859-1"> <META content=3D"MSHTML 6.00.2800.1170" name=3DGENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=3D#ffffff> <DIV><FONT face=3DArial size=3D2>Hello all,</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>In Design-Time I created a form with = many=20 checkboxes which contained no "text".  It looked something like=20 this:</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial=20 size=3D2>----------------------------------------------------------------= --------------</FONT></DIV> <DIV><FONT face=3DArial size=3D2>mycheckboxes:    = 0   =20 0    0    0    = 0</FONT></DIV> <DIV><FONT face=3DArial = size=3D2>mycheckboxes2:  0   =20 0    0    0    = 0</FONT></DIV> <DIV><FONT face=3DArial=20 size=3D2>----------------------------------------------------------------= --------------</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>where "0" is a checkbox. The problem I = am having in=20 Run-Time is that I cannot see the focus on these checkboxes unless there = is text=20 on it. Is there a way I can Override the focus from "text" to the = control=20 itself?</FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2>Yama</FONT></DIV></BODY></HTML> ------=_NextPart_000_0041_01C365A0.FDA46CD0-- Tag: DataGrid Updating DataSource Tag: 54628
  - 11
    - Two Forms and One ImageList How to get <Form2> "to see" an ImageList component on <Form1> at DesignTime, so I can choose it from the ImageList Property ComboBox ? Tag: DataGrid Updating DataSource Tag: 54626
  - 12
    - Getting Form a DataSet is on in design mode. I want to get the TEXT value of the FORM that contains a DataSet component. Unlike Controls, the Component base class does not have a Parent member or any other property that points to the form containing the component. Am I just missing something? Bill Tag: DataGrid Updating DataSource Tag: 54608
  - 13
    - Sending the control back programmatically... Hello, I have about 150 forms and I want to send only the labels 'Send To Back' in the z-order. I tried lbl.SendToBack(); This doesn't seem to help. Did anyone experience the same problem? How did you overcome this? Thanks in advance. Regards. HyperX. Tag: DataGrid Updating DataSource Tag: 54606
  - 14
    - Non-responsive I've created a C# window's form application that migrates data. As it migrates data, the program itself is non-responsive. I would like to implement a cancel button to stop the migration mid-stream. Will I have to use threading to split the tasks or is there another way? Thanks in advance, Jim Christiano Tag: DataGrid Updating DataSource Tag: 54602
  - 15
    - Newbie question on object disposal Hi, In my windows application, I am creating multiple forms that are hidden once the user is finished with them. What is the best way to make sure the form are really destroyed as soon as possible (and that their ressource is released). Any help here would be welcome. James Tag: DataGrid Updating DataSource Tag: 54600
  - 16
    - Resizing issue Hi, I have a win form in VB.net that I want the user to be only able to resize it's height (not the width!). Is there an obvious way to do this? I have tried to put some values in MinimumSize and MaximumSize but it does not seem to affect the form. I have tried to following, it works but it is not nice visually (it shakes on resize): Private Sub OnFormResize(ByVal sender As Object, ByVal e As EventArgs) Handles MyBase.Resize If Me.Size.Width > Me.MaximumSize.Width Then Me.Size = New Size(Me.MaximumSize.Width, Me.Size.Height) End If If Me.Size.Width < Me.MinimumSize.Width Then Me.Size = New Size(Me.MinimumSize.Width, Me.Size.Height) End If End Sub any help would be great! thanks, Rina . Tag: DataGrid Updating DataSource Tag: 54599
  - 17
    - Memory Error (Memory Low) Please, i've an app created with VB.NET, that must runs 24/7. But i'm getting a memory problem. If i use my app 2 or 3 times i get low memory message. If i don't use the application, just let it maximized, the Win2000 Prof. shows me the same message and my process use 500 MB of memory. What could be wrong? All window i use is destroyed and and all object either. Tks in adv. Fabiano --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.509 / Virus Database: 306 - Release Date: 12/8/2003 Tag: DataGrid Updating DataSource Tag: 54594
  - 18
    - Center mouse on a windows form Hi! Does anyone know how to center the mouse on a windows form without leaving managed code? Thanks Konrad Tag: DataGrid Updating DataSource Tag: 54581
  - 19
    - Virtual Memory Please, i have an VB.NET application and i'm getting the SO Virtual Memory Low. I purge all memory at the app, but i still get this error. I have a Windows 2000 Professional with 256 MB computer where i run my app. What could be the possible causes? tks in adv. Fabiano --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.509 / Virus Database: 306 - Release Date: 12/8/2003 Tag: DataGrid Updating DataSource Tag: 54580
  - 20
    - improper exception thrown (Error creating window handle) this took me several hours to find a bug and fix it. I have a complicated form with several combos. After adding few more, I suddenly started to get famous "Error creating window handle". I started to dig through the net, looking for solutions and meanwhile did a lot of experiments. guess what turned out? it turned out that when an object is added to the Combo, the ToString() method of the object fails and you set the global thread exception delegate to your own (to catch all exceptions) you get "Error creating window handle" instead of "Object or reference not set to an instance of an object". this is to warn anyone who gets "Error creating window handle" and does not know why. maybe there are other scenarios when the exception is thrown instead of another, more proper. Regards, Wiktor Zychla here's the shortest example to reproduce the behavior: using System; using System.Drawing; using System.Windows.Forms; using System.Threading; public class CItem { public string Name; public CItem() { } public override string ToString() { return Name; } } public class C : Form { public ComboBox cb; public C() { cb = new ComboBox(); cb.Size = new Size( 120, 20 ); this.Controls.Add( cb ); for ( int i=0; i<10; i++ ) cb.Items.Add( new CItem() ); } public static void Main() { try { Application.ThreadException += new ThreadExceptionEventHandler( MyExceptionHandler ); Application.Run ( new C() ); } catch ( Exception ex ) { Console.WriteLine( ex.Message ); } } public static void MyExceptionHandler( object sender, ThreadExceptionEventArgs e ) { throw e.Exception; } } Tag: DataGrid Updating DataSource Tag: 54571
  - 21
    - Memory leak in Menu Items All the GURUs, Need you help pleeeeaaaaaaaaase. I am having trouble keeping an application working for more than 3-4 hours. It is a business critical app and is suppose to work 24/7. The app runs out of memory because of a memory leak. I did the thorough reasearch and reached to a point where I am stuck. I have created the following sample application extracted from my original application and it reproduces the memory leak. Here is the code, followed by my brief explaination about the code and my findings: /**------------------------------------------------------------**/ using System; using System.Drawing; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; namespace Monitor { /// <summary> /// Summary description for Form1. /// </summary> public class Form1 : System.Windows.Forms.Form { private System.ComponentModel.Container components = null; private System.Windows.Forms.MenuItem menuItemTransaction; private System.Windows.Forms.MenuItem menuItemLoadTruck; private System.Windows.Forms.MenuItem menuItemFile; private System.Windows.Forms.MenuItem menuItemPrinterSetup; private System.Windows.Forms.MenuItem menuItemLogout; private System.Windows.Forms.MenuItem menuItemUpgrade; private System.Windows.Forms.MenuItem menuItemPhInventory; private System.Windows.Forms.Button button1; private System.Windows.Forms.Button button2; private System.Windows.Forms.Button button3; private System.Windows.Forms.Button button4; private System.Windows.Forms.Button button5; private System.Windows.Forms.Button button6; public Form1() { // // Required for Windows Form Designer support // InitializeComponent(); // // TODO: Add any constructor code after InitializeComponent call // } /// <summary> /// Clean up any resources being used. /// </summary> protected override void Dispose( bool disposing ) { if( disposing ) { if (components != null) { components.Dispose(); } } base.Dispose( disposing ); } #region Windows Form 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() { this.button1 = new System.Windows.Forms.Button(); this.button2 = new System.Windows.Forms.Button(); this.button3 = new System.Windows.Forms.Button(); this.button4 = new System.Windows.Forms.Button(); this.button5 = new System.Windows.Forms.Button(); this.button6 = new System.Windows.Forms.Button(); this.SuspendLayout(); // // button1 // this.button1.Location = new System.Drawing.Point(48, 112); this.button1.Name = "button1"; this.button1.Size = new System.Drawing.Size(88, 23); this.button1.TabIndex = 0; this.button1.Text = "AddFile"; this.button1.Click += new System.EventHandler(this.button1_Click); // // button2 // this.button2.Location = new System.Drawing.Point(168, 112); this.button2.Name = "button2"; this.button2.Size = new System.Drawing.Size(88, 23); this.button2.TabIndex = 1; this.button2.Text = "RemoveFile"; this.button2.Click += new System.EventHandler(this.button2_Click); // // button3 // this.button3.Location = new System.Drawing.Point(48, 64); this.button3.Name = "button3"; this.button3.Size = new System.Drawing.Size(88, 23); this.button3.TabIndex = 2; this.button3.Text = "AddMain"; this.button3.Click += new System.EventHandler(this.button3_Click); // // button4 // this.button4.Location = new System.Drawing.Point(168, 64); this.button4.Name = "button4"; this.button4.Size = new System.Drawing.Size(88, 23); this.button4.TabIndex = 3; this.button4.Text = "RemoveMain"; this.button4.Click += new System.EventHandler(this.button4_Click); // // button5 // this.button5.Location = new System.Drawing.Point(48, 160); this.button5.Name = "button5"; this.button5.Size = new System.Drawing.Size(88, 23); this.button5.TabIndex = 4; this.button5.Text = "AddTran"; this.button5.Click += new System.EventHandler(this.button5_Click); // // button6 // this.button6.Location = new System.Drawing.Point(168, 160); this.button6.Name = "button6"; this.button6.Size = new System.Drawing.Size(88, 23); this.button6.TabIndex = 5; this.button6.Text = "RemoveTran"; this.button6.Click += new System.EventHandler(this.button6_Click); // // Form1 // this.AutoScaleBaseSize = new System.Drawing.Size(5, 13); this.ClientSize = new System.Drawing.Size(292, 273); this.Controls.Add(this.button6); this.Controls.Add(this.button5); this.Controls.Add(this.button4); this.Controls.Add(this.button3); this.Controls.Add(this.button2); this.Controls.Add(this.button1); this.Name = "Form1"; this.Text = "Form1"; this.ResumeLayout(false); } #endregion /// <summary> /// The main entry point for the application. /// </summary> [STAThread] static void Main() { Application.Run(new Form1()); } private void AddMainMenu() { this.Menu = new System.Windows.Forms.MainMenu(); } private void RemoveMainMenu() { this.Menu.MenuItems.Clear(); this.Menu.Dispose(); this.Menu = null; } private void AddFileMenu() { this.menuItemFile = new System.Windows.Forms.MenuItem(); this.menuItemPrinterSetup = new System.Windows.Forms.MenuItem(); this.menuItemUpgrade = new System.Windows.Forms.MenuItem(); this.menuItemLogout = new System.Windows.Forms.MenuItem(); this.menuItemFile.Index = 0; this.menuItemFile.Text = "&File"; this.menuItemPrinterSetup.Index = 0; this.menuItemPrinterSetup.Text = "&Printer Setup"; this.menuItemUpgrade.Index = 2; this.menuItemUpgrade.Text = "Upgrade"; this.menuItemLogout.Index = 3; this.menuItemLogout.Shortcut = System.Windows.Forms.Shortcut.CtrlL; this.menuItemLogout.Text = "&Logout "; this.menuItemUpgrade.Click += new System.EventHandler(this.menuItemUpgrade_Click); this.menuItemLogout.Click += new System.EventHandler(this.menuItemLogout_Click); this.menuItemFile.MenuItems.Add(this.menuItemPrinterSetup); this.menuItemFile.MenuItems.Add(this.menuItemLogout); this.menuItemFile.MenuItems.Add(this.menuItemUpgrade); this.Menu.MenuItems.Add(this.menuItemFile); } private void RemoveFileMenu() { this.menuItemFile.MenuItems.Clear(); this.menuItemFile.Dispose(); this.menuItemFile = null; this.menuItemUpgrade.Click -= new System.EventHandler(this.menuItemUpgrade_Click); this.menuItemLogout.Click -= new System.EventHandler(this.menuItemLogout_Click); this.menuItemPrinterSetup.Dispose(); this.menuItemPrinterSetup = null; this.menuItemUpgrade.Dispose(); this.menuItemUpgrade = null; this.menuItemLogout.Dispose(); this.menuItemLogout = null; } private void AddTransactionMenu() { this.menuItemTransaction = new System.Windows.Forms.MenuItem(); this.menuItemLoadTruck = new System.Windows.Forms.MenuItem(); this.menuItemPhInventory = new System.Windows.Forms.MenuItem(); this.menuItemTransaction.Index = 1; this.menuItemTransaction.Text = "&Transactions"; this.menuItemLoadTruck.Index = 0; this.menuItemLoadTruck.Shortcut = System.Windows.Forms.Shortcut.F6; this.menuItemLoadTruck.Text = "&Load Truck "; this.menuItemPhInventory.Index = 1; this.menuItemPhInventory.Text = "&Physical Inventory"; this.menuItemLoadTruck.Click += new System.EventHandler(this.menuItemLoadTruck_Click); this.menuItemPhInventory.Click += new System.EventHandler(this.menuItemPhInventory_Click); this.menuItemTransaction.MenuItems.Add(this.menuItemLoadTruck); this.menuItemTransaction.MenuItems.Add(this.menuItemPhInventory); this.Menu.MenuItems.Add(this.menuItemTransaction); } private void RemoveTransactionMenu() { this.menuItemTransaction.MenuItems.Clear(); this.menuItemTransaction.Dispose(); this.menuItemTransaction = null; this.menuItemLoadTruck.Click -= new System.EventHandler(this.menuItemLoadTruck_Click); this.menuItemPhInventory.Click -= new System.EventHandler(this.menuItemPhInventory_Click); this.menuItemLoadTruck.Dispose(); this.menuItemLoadTruck = null; this.menuItemPhInventory.Dispose(); this.menuItemPhInventory = null; } private void menuItemLoadTruck_Click(object sender, System.EventArgs e) { } private void menuItemLogout_Click(object sender, System.EventArgs e) { } private void menuItemUpgrade_Click(object sender, System.EventArgs e) { } private void menuItemPhInventory_Click(object sender, System.EventArgs e) { } private void button1_Click(object sender, System.EventArgs e) { AddFileMenu(); } private void button2_Click(object sender, System.EventArgs e) { RemoveFileMenu(); } private void button3_Click(object sender, System.EventArgs e) { AddMainMenu(); } private void button4_Click(object sender, System.EventArgs e) { RemoveMainMenu(); } private void button5_Click(object sender, System.EventArgs e) { AddTransactionMenu(); } private void button6_Click(object sender, System.EventArgs e) { RemoveTransactionMenu(); } } } /**-----------------------------------------**/ The above sample app. has six buttons to create and destroy all the menu items. If I create the full menu, its structure will be like this: Main Menu - File - Printer Setup - Logout - Upgrade - Transaction - Load Truck - Physical Inventory Now, if you run this sample application, and click in this sequence "AddMain" - "AddFile" - "RemoveFile" - "RemoveMain" all the menu items will not be destroyed and you will have a reference in the memory and it will not be collected by GC. BUT, if you change the sequence to "AddMain" - "AddFile" - "RemoveMain" - "RemoveFile", now it will remove everything from memory and its clean. I don't understand a bit why this behaviour. Now the LAST and the most important: Earlier I added only one submenu and it gets removed completely if I use the second click-sequence, BUT if I add two submenus, there is no way I can get rid of all of them in any way. By doing different permutation and combination the most optimum that I found was the following sequence: "AddMain" - "AddFile" - "AddTransaction" - "RemoveMain" - "RemoveFile" - "RemoveTransaction". Still I have three menu items in the memory and this accumulates everytime I create or destroy the menu. I don't know what to do now. Please see if it makes any sense to you. You can directly write to me at mmisran@ekomcorp.com Thanks in advance -Manoj Misran Tag: DataGrid Updating DataSource Tag: 54570
  - 22
    - Exporting to Excel I have a routine that takes a DataTable and exports it to Excel. Works fine and dandy on my machine, which has the Office 11 Beta on it. But it of course doesn't work on anybody else's machine because the have Office 2000 on there machine. How can I make this export function work with Office 2000. I only have the version 11 Type Library on my machine. I looked for another version, but could not find it. Tag: DataGrid Updating DataSource Tag: 54569
  - 23
    - ListView control functionality issues Hello, I have a few functionality issues with the ListView control that I'm hoping someone might be able to shed some light on. 1) I need to be able to hide the vertical scroll bar but still allow scrolling programmatically. The Scrollable property hides the vertical scroll bar but also prevents the items in the list from being scrolled programmatically. 2) I want to display the horizontal scroll bar at all times. I can kludge a work-around for this by forcing the combined column widths to always exceed the width of the control, however, this isn't aesthetically pleasing and I'm hoping there's a more elegant way to accomplish this. 3) Set the foreground and background colors for a selected item in a control that doesn't have focus. If I set .HideSelection = False then when the control losses focus it continues to display the highlighted item(s), however, the background color is gray. I need to be able to set the foreground/background colors to a different setting. If anyone can provide any assistance on these items, it will be greatly appreciated. Thanks, John Tag: DataGrid Updating DataSource Tag: 54563
  - 24
    - TreeView - Selecting Multiple Nodes Is there a way to allow selection of multiple nodes in a TreeView control? I suppose I might want two ways to select multiple nodes: 1) with a mouse drag, highlighting multiple nodes 2) Using a combination of Ctrl and Shift key presses to select multiple nodes (like in Windows Explorer). For what it's worth, I'm only concerned with selecting multiple sibling nodes (i.e. groups of nodes under a single parent node). I don't see anything in the TreeView API that would appear me to select multiple nodes. Is this possible? If so, any suggestions on how to implement would be much appreciated. Thanks, Tim Rogers Tag: DataGrid Updating DataSource Tag: 54562
  - 25
    - Help - Can not change form designs after localization Hi, We have just localized our application (to Chinese). One developer did on his machine. After that, it still runs well on other machines. We can debug it too on other machines. The problem is that any change to the form layouts on the other machines will cause the forms layout screwed up. You can design a form, but when it runs, it does not display what we see in the design mode (with same lang setting). Properties such as 'anchor' are lost when we reopen the form in design mode too. Has any one experienced this before? If yes, what is your solution? I am using VS.net 2003. Thanks James Tag: DataGrid Updating DataSource Tag: 54561

I have a datagrid that displays a few columns from a table.
I need to be able to update a process date on each row if
any of the displayed columns get updated. The process
date ("UPDT_DT") is not in the datagrid. I put an event
handler on the textboxes in the grid so I can capture when
a change occurs, but I can't seem to get the process date
column updated.
Here is the code I tried:
CType
(Me.BindingContextdgLists.DataSource, "UW_LISTS").Current,
DataRowView).Row.Item("UPDT_DT") = Date.Now

The line of code executes but when "UPDT_DT" is updated it
resets the row in the data grid.

Any ideas of how to accomplish this task ?

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Re: DataGrid Updating DataSource by Dmitriy

Dmitriy
Thu Aug 21 01:22:53 CDT 2003

Hi John,

First of all, this piece looks a little bit "alien" to me:

> Me.BindingContextdgLists.DataSource

I'd suggest to ensure that the right source is referenced by this property -
just to be safe.

Second, you might try to call AcceptChanges on a row after the
ProcessingDate gets updated. The reason is that the grid's binding manager
could just roll back your change when data grid pushes updated data back to
the data source.

Third, you may try to handle DataView's ListChanged event instead and react
on ItemChanged notifications.

--
Dmitriy Lapshin [C# / .NET MVP]
X-Unity Unit Testing and Integration Environment
http://x-unity.miik.com.ua
Deliver reliable .NET software

"John zink" <john.zink@prudential.com> wrote in message
news:0d9e01c3672b$1afb5740$a401280a@phx.gbl...

> I have a datagrid that displays a few columns from a table.
> I need to be able to update a process date on each row if
> any of the displayed columns get updated. The process
> date ("UPDT_DT") is not in the datagrid. I put an event
> handler on the textboxes in the grid so I can capture when
> a change occurs, but I can't seem to get the process date
> column updated.
> Here is the code I tried:
> CType
> (Me.BindingContextdgLists.DataSource, "UW_LISTS").Current,
> DataRowView).Row.Item("UPDT_DT") = Date.Now
>
> The line of code executes but when "UPDT_DT" is updated it
> resets the row in the data grid.
>
> Any ideas of how to accomplish this task ?

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