Help!!! Visual Inheritance......

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- Previous
  - 1
    - Main Menu Toolbar Icon is not coming out. I have a Main Menu coded in VB.Net, which contains a Toolbar on top. There are 10 buttons with image on the Toolbar. During design time, the image on the Toolbar button can be displayed. But, during runtime, all images on the Toolbar button cannot be displayed out. Why? Thanks. Tag: Help!!! Visual Inheritance...... Tag: 79020
  - 2
    - Why does transparency only work sometimes with 32 bit color depth? I have an application that uses transparency. My video settings are 1600x1200 and 32 bit color. I can make the main dialog transparent but other controls and child windows are not transparent, I see the colored box around my control. If I switch my color depth to 16 bit everything is fine. Why does it work on some forms but not others. I can even make my main form transparent and drop a custom control that has transparency set. The main form goes transparent but the custom control has a blue (my transparent color) box around it. Again if I switch color depth it works fine. I heard that somewhere in the .NET documentation it says transparency is not supported under 32 bit color. I have a hard time believing this. Are there any computers that don't come in 32 bit color mode anymore? Jim Tag: Help!!! Visual Inheritance...... Tag: 79008
  - 3
    - Memory leak - Forms with Owners I have created a project that has two forms. Form1 has a button which runs the following code: private void button1_Click(object sender, System.EventArgs e) { Form2 f = new Form2(); f.Owner = this; f.Show(); f.Close(); this.RemoveOwnedForm(f); f.Dispose(); f = null; } Using .NET Memory Profiler (http://www.scitech.se/memprofiler) I am able to see that Form2 is not disposed. This seems to be a huge issue. Has anyone experienced this problem? Is there a workaround? Have I done something incorrectly? If I remove the line where the Owner is set, there is no problem with Form2 being Disposed. Thanks, Nate Tag: Help!!! Visual Inheritance...... Tag: 79001
  - 4
    - Memory leak - Forms with Owners I have created a project that has two forms. Form1 has a button which runs the following code: private void button1_Click(object sender, System.EventArgs e) { Form2 f = new Form2(); f.Owner = this; f.Show(); f.Close(); this.RemoveOwnedForm(f); f.Dispose(); f = null; } Using .NET Memory Profiler (http://www.scitech.se/memprofiler) I am able to see that Form2 is not disposed. This seems to be a huge issue. Has anyone experienced this problem? Is there a workaround? Have I done something incorrectly? If I remove the line where the Owner is set, there is no problem with Form2 being Disposed. Thanks, Nate Tag: Help!!! Visual Inheritance...... Tag: 79000
  - 5
    - WM_KEYDOWN, WM_CHAR and WM_KEYUP I am using SendMessage() to send characters to a window. After using Microsoft Spy++ to look at window messages when I click a key, I noticed that the enter key sends WM_KeyDown WM_Char and WM_KeyUp but the home key only sends WM_KeyDown and WM_KeyUp. Is there some rule I can use to tell if I should send the WM_Char or not? Tag: Help!!! Visual Inheritance...... Tag: 78986
  - 6
    - exceptionless exceptions in masked edit box Hello, I encountered something to that, even though I have worked it out for myself, I thought should be passed on. While I was debugging an event handler (Validating) for a masked edit box, I suddenly found myself 'back in the UI'. The line of code that precipitated the surprise exit from the event handler to the UI happened to generate a null reference exception, but no detectable exception was reported (either in the IDE debug run or in the released program). The line of code was not in a try/catch block (there are others in the handler and, when appropriate, they are triggered). It was the true source of the bug being worked on, but it was not detected until much later in the code because as far as anyone knew the event handler validated the control quite nicely. I figure that whatever 'hidden' code calls the event handler does so from within its own try/catch block. When it encounterd this particular exception, it simply returned execution to the 'UI thread' (no explicit multi-threading was used in the program, that descriptive phrase was intended to limit verbiage (looks like I failed there)). I don't know if this is just an issue with the masked edit box or with more controls. Thought you'd like to know, mklapp Tag: Help!!! Visual Inheritance...... Tag: 78983
  - 7
    - ok to use threading in winforms for remote connections? Is it proper to use threading in winforms to retrieve data from a remote sql server? I thought about setting the timeout period in the connection string, but what would be better is to start my bind() function in a new thread so the app isn't tied up searching for the sql server. Any problems I should be aware of? -Max Tag: Help!!! Visual Inheritance...... Tag: 78982
  - 8
    - How TO DO VS.NET Resizable Tear Off MDI(s) Does any body know how to do visual studio.net style resizable tear off MDI(s)? I have played with the new splitter tool in vb.net 2005 and it is somthing like what I am trying to do but it doesn't have closing or push pen abilities. -- Think, Speak & breath Code! Tag: Help!!! Visual Inheritance...... Tag: 78980
  - 9
    - Stream Writer Hello, I have created a MemoryStream that is holding Binary Data. How do I get the Data out of the Memory Stream into a file on my hard drive. All the examples I have seen for a MemoryStream write the contents to the console. Thanks Chuck Tag: Help!!! Visual Inheritance...... Tag: 78972
  - 10
    - Inherited Form Designer gives Exception Hi, I have Project1 in which I have frmBase. I compiled the code and then added an inherited form(frmChild) to the project which inherits from frmBase. When I open the designer for frmChild the designer throws an exception, "Object reference not set to an instance of an object." Please help, what should I do to use inheritance within a project. Thanx, Debi Tag: Help!!! Visual Inheritance...... Tag: 78971
  - 11
    - Global connection strings? I have a question regarding connection strings. Most of my apps have multiple forms each of which stores a connection string back to (generally speaking) the same SQL db (i.e. it's set up the way that VS.Net appears to work by default). Is there any advantage in having some kind of global connection string? (...apart from the obvious one about making it easier to update if the db moves to a different server...). What is best practice? Thank you Tag: Help!!! Visual Inheritance...... Tag: 78970
  - 12
    - this.size doesn't come out to 1024*768 it says width: 1030 height: 774 I have my form maximized. what causes this discrepancy, and how do i correct it? I can notice that the contents on the screen are not centered. thanks again! Tag: Help!!! Visual Inheritance...... Tag: 78969
  - 13
    - Default file type handlers Is there a way to get the path to the application that is the default handler for a given file type w/o having to manually crawl around the registry? Tag: Help!!! Visual Inheritance...... Tag: 78966
  - 14
    - LinkArea not Deserializable Create a form, drop a LinkLabel on it, and set the form's Localizable property to True in the designer. If you run this with full trust, everything works. Run it without full trust (by going to the command line and running \\localhost\...\program.exe) and you will get the following exception: System.Security.SecurityException: Request for the permission of type System.Security.Permissions.SecurityPermission, mscorlib, Version=1.0.5000.0, Culture=neutral, PublicKeyToken=b77a5c561934e089 failed. at System.Runtime.Serialization.Formatters.Binary.ObjectReader.CheckSecurity(ParseRecord pr) at System.Runtime.Serialization.Formatters.Binary.ObjectReader.ParseObject(ParseRecord pr) at System.Runtime.Serialization.Formatters.Binary.ObjectReader.Parse(ParseRecord pr) at System.Runtime.Serialization.Formatters.Binary.__BinaryParser.ReadObjectWithMapTyped(BinaryObjectWithMapTyped record) at System.Runtime.Serialization.Formatters.Binary.__BinaryParser.ReadObjectWithMapTyped(BinaryHeaderEnum binaryHeaderEnum) at System.Runtime.Serialization.Formatters.Binary.__BinaryParser.Run() 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 Clientele.Utility.DbHealthChecker.ConfigurationSettingForm.InitializeComponent() at Clientele.Utility.DbHealthChecker.ConfigurationSettingForm..ctor() at Clientele.Utility.DbHealthChecker.MdiMainForm.MdiMainForm_Load(Object sender, EventArgs e) at System.Windows.Forms.Form.OnLoad(EventArgs e) at System.Windows.Forms.Form.OnCreateControl() at System.Windows.Forms.Control.CreateControl(Boolean fIgnoreVisible) at System.Windows.Forms.Control.CreateControl() at System.Windows.Forms.Control.WmShowWindow(Message& m) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ScrollableControl.WndProc(Message& m) at System.Windows.Forms.ContainerControl.WndProc(Message& m) at System.Windows.Forms.Form.WmShowWindow(Message& m) at System.Windows.Forms.Form.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) Basically, this stops us from using a LinkLabel when our forms are localizable and the EXE isn't run with full trust. Tag: Help!!! Visual Inheritance...... Tag: 78965
  - 15
    - DataGrid cell double click event How can I know every time a user made a double click in a cell of my dataGrid?? Tag: Help!!! Visual Inheritance...... Tag: 78963
  - 16
    - WS_EX_LAYERED/LockWindowUpdate problem Hello, I use LockWindowUpdate() API function through P/invoke to prevent updating form content while updating/removing/adding something in form (child controls). Despite of the bug in W2k (Q270624, Layered Windows Disappear During Calls to the LockWindowUpdate() Function) I do something like this: 1. Remove WS_EX_LAYERED attribute from form through SetWindowLong API 2. Call LockWindowUpdate 3. some updates (adding/removing child controls through standard .NET methods) 4. Call LockWindowUpdate - for form unlock 5. set back WS_EX_LAYERED flag on a form 6. redraw form but on W2k after a point 5 form disappears and I cannot resolve this issue. Thanks in advance -bda- Tag: Help!!! Visual Inheritance...... Tag: 78960
  - 17
    - drawing text, autosizing textbox, flickering ... Hi (VS.Net 2003 + SP), how to make anchored textboxes, toolbars or statusbar not to flicker on resize? And one more thing, I wanted to make multiline textbox to autosize in height and width. Since autosizing is done only in singleline, I used prefferedSize= Graphics.MeasureString(control.text, control.font) to get required size. But after resizing textbox, I saw that it is too wide and height is less than required. So I tried to paint text myself. Then I saw, that everyline of that text is painted differently (using standart font, same text on every line), changing text to Arial 9pt, helped a bit. But anyway it is too wide and height is less than required for textbox. How to implement full autosizing for textbox? Tag: Help!!! Visual Inheritance...... Tag: 78951
  - 18
    - Status images in DataGrid Hello, is there any way how to use first column (RowHeader) to display custom images (e.g. status icons)? Thanks a lot Vladimir Tag: Help!!! Visual Inheritance...... Tag: 78946
  - 19
    - Display deleted rows in DataGrid Hello, I use DataGrid that displays data from DataTable. When I delete a row, this row disapears in DataGrid and changes it's status in DataTable. I there any way how to display everything what's in DataTable? I want that user will see all changes made and after clicking some "Commit" button those changes will be saved into the database. Thanks a lot Vladimir Tag: Help!!! Visual Inheritance...... Tag: 78944
  - 20
    - using F7 as shortcort doesn't work? Hi, I am having trouoble using the F-kesy as shortcuts. The shortcut is defines like this (c#): btnRun.Shortcut = Shortcut.F7; I have provided the button with a valid eventhandler that works just fine when pressing the button, but pressing the F7 key doesn't trigger anything at all. All my other shortcuts that doesn't use F-keys are defined in the same and they work just fine. Has anyone experinced the same problems and maybe found a solution? Thank you. Torben Tag: Help!!! Visual Inheritance...... Tag: 78943
  - 21
    - DataGrid - reduce flicker-free hi, How to make datagrid flicker-free? I have tried to set ContorlStyle double buffering options, but seems not working well. thanks Tag: Help!!! Visual Inheritance...... Tag: 78938
  - 22
    - Unable to keep form on top I'm trying to create a screensaver using managed directx, but the same happens with the wizard generated screensaver project in VC# 2005. Any window set to "always on top" is not getting obscured, like the standard windows screensavers can. I've tried setting the presentparams for the device constructor to "windowed=false". I've set the form property Toplevel=true, topmost=true, and called .bringtofront(). Anybody know what I'm missing? Tag: Help!!! Visual Inheritance...... Tag: 78934
  - 23
    - Controls created on one thread cannot be parented to a control on a different thread I am trying to make a window that pops up, to show that my application is busy. I want it to be able to be called from anywhere, any thread, so I put it as a static method in a class. Code listed below. The problem is, no matter what I can think of doing, I get the following exception: "Controls created on one thread cannot be parented to a control on a different thread" Trace: at System.Windows.Forms.Control.MarshaledInvoke(Control caller, Delegate method, Object[] args, Boolean synchronous) at System.Windows.Forms.Control.Invoke(Delegate method, Object[] args) at UI.Waiter.Busy(Object waitOn) or i used to get this with a slightly different configuration (same exception): Trace: at System.Windows.Forms.ControlCollection.Add(Control value) at System.Windows.Forms.ControlCollection.Add(Control value) at UI.Controls.WaitForm.InitializeComponent() at UI.Controls.WaitForm..ctor() at UI.Waiter..cctor() Anyone got any ideas... or am i going about it the wrong way all together!? Cheers Greg ----- CODE ----- using System; using System.Collections; using System.Threading; using System.Windows.Forms; namespace UI { /// <summary> /// Summary description for Waiter. /// </summary> public sealed class Waiter { private static ArrayList _list = new ArrayList(); private static Mutex _lock = new Mutex(); private static Controls.WaitForm _form = null; private static Form _parent = null; public static Form Parent { get { return _parent; } set { _parent = value; } } private Waiter() { } private delegate void BusyDelegate( object obj ); public static void Busy( object waitOn ) { if( _parent != null ) _parent.Invoke( new BusyDelegate( InternalBusy ), new object[] { waitOn } ); } private static void InternalBusy( object waitOn ) { // this has to be done here for threading reasons if( _form == null ) _form = new Controls.WaitForm(); // show the waiting form _lock.WaitOne(); try { _list.Add( waitOn ); if( _list.Count == 1 ) { _form.Restart(); _form.Show(); System.Windows.Forms.Application.DoEvents(); } } finally { _lock.ReleaseMutex(); } } public static void Ready( object waitOn ) { _lock.WaitOne(); try { _list.Remove( waitOn ); if( _list.Count == 0 ) { _form.Hide(); } } finally { _lock.ReleaseMutex(); } } } } Tag: Help!!! Visual Inheritance...... Tag: 78931
  - 24
    - embedded powerpoint diasshow Does anyone know how to embed a powerpoint presentation in a windows forms applikation. I can't find any documentation on how to do this anywhere. Seems there isn't an Active-X control for viewing powerpoint presentations from within another application. Regards Ole Inselmann Tag: Help!!! Visual Inheritance...... Tag: 78920
  - 25
    - Problem using SHBrowseForFolder I am using VS 2003, .net 1.1 I am trying to use the SHBrowseForFolder dialog, as wrapped up in a component from CodeProject (I don't have the URL handy). The dialog appears, but the treeview does not. I get the same result using the old .net 1.0 method with FolderNameEditor and FolderBrowser(). It used to work before I upgraded to 1.1 . Any suggestions? TIA, Art Tag: Help!!! Visual Inheritance...... Tag: 78918
- Next
  - 1
    - fileacces problems Hi, I'm in the middle of developing a c# project. When I run my application from VS.net it's run from the projects bin\debug library. My problem is, that when closing the application I am writing a xml file containing some settings to this library, but I get an "Access denied error". I am experiencing this error because the debug folder is marked as "read only". It doesn't matter if I uncheck the "read only" checkbox, because everytime my project is compiled, it is set again. How do I change this, and why is the acces to this folder restricted to "read only"? Thank you. Best regards Torben Tag: Help!!! Visual Inheritance...... Tag: 78915
  - 2
    - How to make a UI which resembles the VS.NET 2003 IDE UI Hello! The VS.NET 2003 user interface has very nice details. The small areas which look like windows and which may slide away if you don't need them for the moment. Can't some of you illustrate a bit how such details may be built? Best regards, Henrik Dahl Tag: Help!!! Visual Inheritance...... Tag: 78913
  - 3
    - Autocomplete combobox For all of you who are searching for auto complete functionality in .net combobox. I wrote this code yesterday after being unable to find something usable and workable on the internet. All examples that I've tried either bulky and simply not elegant and inefficient or does not work properly. Maybe I was just not lucky and patient enough to try more examples :) instead I wrote my own code. Hope it helps someone. I appreciate all comments and bugs in the following code being posted back to the group. Regards, Michael Shapiro P.S. call this sub from KeyUp event of the combobox Public Sub AutoComplete(ByVal cbo As System.Windows.Forms.ComboBox, ByVal e As System.Windows.Forms.KeyEventArgs) Dim index As Integer Dim p As Integer Select Case e.KeyCode Case Keys.Back, Keys.Left, Keys.Right, Keys.Up, Keys.Down, Keys.Delete, Keys.Tab Return End Select p = cbo.SelectionStart index = cbo.FindString(cbo.Text.Substring(0, p)) If index = -1 Then Return cbo.SelectedIndex = index cbo.SelectionStart = p cbo.SelectionLength = cbo.Text.Length End Sub Tag: Help!!! Visual Inheritance...... Tag: 78911
  - 4
    - Docked panels and Z-order problem. Hallo=2E I have two panels docked on the right of the form (p1 on the left= and p2 on the right) and I want third panel to slide from right= to left into a view between p1 and p2 (Just like Solution= Explorer window in Visual Studio ? if it is in auto hide mode= its slides to left when mouse is over it), but when I put my= third panel on Controls list of the form, set it child index= between those two and start to slide I have opposite effect ?= the p1 is visible and p2 is hidden ? it is a way to do this= right ??? -------------------------------- From: Dominik Jeske ----------------------- Posted by a user from =2ENET 247 (http://www=2Edotnet247=2Ecom/) <Id>yW8wOI8ZAk6AmAd7vIZBcg=3D=3D</Id> Tag: Help!!! Visual Inheritance...... Tag: 78906
  - 5
    - Problem with Z-ordering !!! Hallo !! I have two panels docked on the right of the Form (z order index= p1: 0, p2: 1) and I want to third panel slide from the right= between those two panels (just like in Visual studio when you= put mouse over autohided SolutionExplorer its slides to view)= but because of z-ordering when I put my control on the form and= set his ChildIndex between those two I have opposite effect ? p2= is hided and p1 is visible ? any idea how to do this right ?= ????????? -------------------------------- From: Dominik Jeske ----------------------- Posted by a user from =2ENET 247 (http://www=2Edotnet247=2Ecom/) <Id>VZCLNlkgMEinfTjACsJSzg=3D=3D</Id> Tag: Help!!! Visual Inheritance...... Tag: 78905
  - 6
    - Form transparency issues Recently I wanted to create a small little program that could sit= on the desktop and not block the desktop wallpaper=2E There are= two methods to accomplish this ( that I am aware of )=2E 1) create a solid color bmp as a background image and set the= transparency key to match its color 2) specify the form's background color with a matching= transparency key Now my issues with both methods, but first it should be known= that I have set the forms to have no border or title bar and= have implemented code that allows me to click-and-hold anywhere= ( with exceptions listed below ) on the form and move it=2E The= data actually displayed on the form is just text and one= rectangle, all drawn by me ( there are no controls on the form= itself )=2E 1) I have two issues with this method, although it is what I'm= prefering to use at the moment=2E The first seems to be the= discrepancy between how the program is handled when the= computer's Color Depth is 32bit or when it is less than 32bit (= 16bit )=2E When the color depth is 32bit then I am able to click= on the entire area the form inhabits ( even that which is= transparent ) and move it, but if the color depth is less than= 32bit ( 16bit ) then only the drawn text or rectangle outline (= since it has no fill ) can be clicked to drag the program= around=2E Clicking on the transparent areas just passes the click= through the form to whatever is below ( even when I know the= form has focus )=2E I'd like to be able, regardless of the= desktop's color depth, to click anywhere within the form area= and move the application=2E The second issue I have with this method occurs when I take my= executable and put it on another PC ( my PC is XP Pro, the other= PC is XP Home=2E=2E Both SP2 )=2E The problem is similar, but a= little different=2E When the 2nd PC's color depth is at 32bit,= the transparency does not work=2E The green/lime ( that's the= transparent color I'm using ) background shows=2E Needless to say= this is not acceptable=2E When I change the color depth to less= than 32bit ( 24bit this time ), the transparency actually works,= but I come across the same issue of clicks on the transparent= areas just passing through=2E 2) With this method I have not tried it on a 2nd PC yet ( I don't= have it available where I am atm )=2E Its basically the same= "issue" as mentioned above with color depth less than 32bit,= except it does it with a color depth of 32bit and 16bit=2E Clicks= on the transparent areas just pass right through=2E I'm tempted= to just go with this method and possibly make one area on the= form that is meant to be used to drag it around ( similar to the= idea of the box that appears to move tables in MS Word ), but= I'm hoping there's a solution I'm unaware of before I do that=2E Anyways, all of this brings up some interesting questions=2E -What does color depth have to do with transparency handling? -Does the version of XP ( Home or Pro ) handle transparency= differently? Probably some more questions also=2E Not sure if it matters, but I'm doing all of this in C#=2E So any ideas to get pass any of these issues? Thanks in advance=2E -------------------------------- From: othell m=2E ----------------------- Posted by a user from =2ENET 247 (http://www=2Edotnet247=2Ecom/) <Id>8xrsHvZKNkGRSJumCntIww=3D=3D</Id> Tag: Help!!! Visual Inheritance...... Tag: 78904
  - 7
    - Odd closing problem I have a base form with a Cancel button (btnCancel) and a simple msgbox routine. I would like to have a routine closing check to prevent loss of data. Dim i As Integer i = MsgBox("Exit?", MsgBoxStyle.YesNo + MsgBoxStyle.Question) If i = MsgBoxResult.Yes Then Me.DialogResult = DialogResult.Abort Me.Dispose() End If I have another form that inherits from the base form. In both parent and decendent the Cancel button property of the form is set to (None). The problem is this. Even given the above, even given that I've traced the code and can see that the Me.dispose call is NOT being made when I click No, the form still closes. Any suggestions as to what I might be overlooking? Tag: Help!!! Visual Inheritance...... Tag: 78900
  - 8
    - Formatting txtPhone I have a txtPhone that I need to format like 555-555-5555 and when a user inputs numbers it should only take numbers. Tag: Help!!! Visual Inheritance...... Tag: 78899
  - 9
    - strange problem with binding collection object to listbox control I have a business object with two public properties - "OrganizationID" and "OrganizationName". Pretty typical. We will call it Organization. And I have a collection object which is an arraylist that stores a collection of the business object described above. Let's call it Organizations I have a lstbox control. So I bind it Organizations to the listbox control. lstSelectedOrgs.DataSource = null; lstSelectedOrgs.ValueMember = "OrganizationID"; lstSelectedOrgs.DisplayMember = "OrganizationName"; lstSelectedOrgs.DataSource = Organizations; I initially populate the control. Then I have a way to remove an item. And then I bind it again. At some point, all of a sudden, what shows up in the list box looks like this. MyNameSpace.Organization Tag: Help!!! Visual Inheritance...... Tag: 78895
  - 10
    - how do I set the version information? How do I set the version of my app? I can do this in the setup app, but it does not coincide with the actual application. -Max Tag: Help!!! Visual Inheritance...... Tag: 78894
  - 11
    - Beta Readers Wanted - Whidbey C# - (O'Reilly Author) This is a one time request for beta-readers for a new book I'm working on. ************* I'm writing a new book on Visual C# 2.0 - target audience is C# 1.x programmers looking to move up to 2.0 (code-name Whidbey). The ideal candidates have been programming in Visual C# 1.x for a while, are familiar with and comfortable with all the language fundamentals, delegates, creating windows and web applications and so forth and are ready to learn what is new in Visual Studio and C# 2.0, as well as highlights of what is new in creating Windows and Web Applications. I will post the chapters after I've written them but before they've been edited or tech-reviewed. Your job will be to provide guidance and advice as to how helpful the chapter is, what is missing, what could be clearer, etc. You can expect to read (and respond to) about 40-50 pages per week through Thanksgiving; starting next week. Ideally, you'll have the Visual Studio 2.0 Beta installed on a computer and will be able to try the exercises, though this is not strictly required. There is no financial compensation (though active participants will receive a copy of the book when it is published, and an acknowledgement in the book itself). You will need to sign a Non-disclosure agreement and you'll need to join a forum on Delphi (membership is free). If you are interested, please send me email (jliberty@LibertyAssociates.com) with your name, email, C# experience, etc. Thank you. Jesse Liberty Author: Programming C# Programming Visual Basic .NET Programming ASP .NET Programming Windows .NET Applications Numerous other books http://www.LibertyAssociates.com Tag: Help!!! Visual Inheritance...... Tag: 78893
  - 12
    - Logic Help I need some help with user names and passwords (five users and one password for each user). I have two txtboxes (txtName, txtPassword). If a user clicks enter and both are empty then a message is displayed, "enter user name." If just the name is entered the message "enter password." If wrong name and right password then message "re-enter name." If right name and wrong password message "valid name, wrong password." I cant figure this out, can someone help me please? The names are tied to a passwords, for example a user might have 123 for a name and a password of 456 Tag: Help!!! Visual Inheritance...... Tag: 78879
  - 13
    - Make checkbox larger Who knows how to make the actual check box rectangle larger? Is the onlyway to inherit from checkbox and override its paint method or something? thanks Tag: Help!!! Visual Inheritance...... Tag: 78865
  - 14
    - Using designer without Forms My program consist of different panel that I load and unload on a form. I would like to be able to user the Form designer directly on a panel without using a form since this panel will be put on a form at run time. Any ideas? Tag: Help!!! Visual Inheritance...... Tag: 78864
  - 15
    - scrolling a user control Hi, I have created a user control which I then add standard controls to prgramatically i.e. picture box, text box etc. I'm just wondering if it is possible to scroll to given position in the scrollable region? So lets say the control has a height of 300 pixels and the scrollable height is 1000 pixels then I'd like to be able to just make pixel 500 appear in the top left of the controls visible area. If this isn't possible what alternatives are there for scrolling a user control programatically. Many thanks in advance for any answers. Best Regards, Steve. Tag: Help!!! Visual Inheritance...... Tag: 78861
  - 16
    - Icon in tray with Windows Service How can i get an icon in the tray to allow for service control/configuration? I have tried allow service to interact, but it didn't work like i wanted, i could see the icon but i couldnt do anything with the context menu. TIA. Tag: Help!!! Visual Inheritance...... Tag: 78856
  - 17
    - Error: Specified Cast is invalid Hello: Hope you can help me. Below is the code in Windows Forms VB to Export the "Notifications.rpt" Crystal reports to PDF. This report is connected to a dataset. The oRptNOTE.Export() line is failing. I am not sure why. Dim oRptNOTE As Notifications oRptNOTE = New Notifications oRptNOTE.SetDataSource(Dataset12.notification) Dim DiskOpts As CrystalDecisions.Shared.DiskFileDestinationOptions = New CrystalDecisions.Shared.DiskFileDestinationOptions oRptNOTE.ExportOptions.ExportDestinationType = CrystalDecisions.[Shared].ExportDestinationType.DiskFile oRptNOTE.ExportOptions.ExportFormatType = CrystalDecisions. [Shared].ExportFormatType.PortableDocFormat DiskOpts.DiskFileName = "c:\temp\test2.pdf" oRptNOTE.ExportOptions.DestinationOptions = DiskOpts oRptNOTE.Export() Tag: Help!!! Visual Inheritance...... Tag: 78853
  - 18
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  - 19
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  - 20
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  - 21
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  - 22
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  - 23
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  - 24
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  - 25
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Hi,
I want to know if I'm doing something wrong. I'm inheriting frmChild
from frmBase in Project1. frmBase is referring to its MdiParent in a function
call from Form_Resize event. When I try to open the designer for the frmChild
it throws an exception for this, saying "Object reference not set to an
instance of an object."

Why is this happening. Does that mean I cannot use any runtime
instanciation in a base form? Or do I have to turn something off? Why is the
code executing in the designer. If I give a message box in the base form, it
pops up when I am loading the Child form!!!!!

Any help is appreciated..

Thanx,
Debi

Re: Help!!! Visual Inheritance...... by Sijin

Sijin
Tue Oct 19 06:03:59 CDT 2004

In your form_resize event just add a check to see if form.MdiParent is
null and if so then do nothing.

Sijin Joseph
http://www.indiangeek.net
http://weblogs.asp.net/sjoseph

Debi wrote:
> Hi,
> I want to know if I'm doing something wrong. I'm inheriting frmChild
> from frmBase in Project1. frmBase is referring to its MdiParent in a function
> call from Form_Resize event. When I try to open the designer for the frmChild
> it throws an exception for this, saying "Object reference not set to an
> instance of an object."
>
> Why is this happening. Does that mean I cannot use any runtime
> instanciation in a base form? Or do I have to turn something off? Why is the
> code executing in the designer. If I give a message box in the base form, it
> pops up when I am loading the Child form!!!!!
>
> Any help is appreciated..
>
> Thanx,
> Debi

RE: Help!!! Visual Inheritance...... by JLeBert

JLeBert
Tue Oct 19 10:09:02 CDT 2004

The problem is that a number of events fire when a form is in design mode. If
you have code in your event handler, it will probably mess things up. The
solution is to check the DesignMode property. If it is True then skip your
code.

It is "correct" for the events to fire in the designer because you might
have custom controls or forms that need special logic such as rearranging
child controls when the custom control/form is resized.

NOTE the DesignMode property is set after the code in the constructor runs.
If you have code in the constructor or that is called in the constructor,
then DesignMode will be False even though you really might be in DesignMode.