Microsoft KB Archive/886686

Knowledge Base

FIX: You can close a form by using the Close button even if the Cancel property of a Validating event is set to True on an object in a Windows Forms application in the .NET Framework 1.1

Article ID: 886686

Article Last Modified on 5/18/2007

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APPLIES TO

• Microsoft .NET Framework 1.1

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Notice

SYMPTOMS

In the Microsoft .NET Framework 1.1, you may have a control that is contained within a UserControl object in a Windows Form. When you set the Cancel property to True in a Validating event on the control, you expect not to be able to close the form by using the Close button. However, this operation has not been disabled. Therefore, you can close the form by using the Close button.

RESOLUTION

This problem has been fixed in the .Net Framework 1.1 SP1 Rollups for System.Windows.Forms.dll package. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

887540 Description of the .NET Framework 1.1 post-Service Pack 1 hotfix rollup package for System.windows.forms.dll

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

MORE INFORMATION

Steps to reproduce the problem

1. Start Microsoft Visual Studio .NET 2003.
2. On the File menu, click New, and then click Project.
3. Click Visual Basic Projects, click Windows Control Library, and then click OK.
4. Add a TextBox control to the UserControl object.
5. Double-click the TextBox1 control, and then click Validating in the Method Name list.

6. Add the following code to the TextBox1_Validating event:

       e.Cancel = True

7. On the Build menu, click Build Solution.
8. On the File menu, click Add Project, and then click New Project.
9. Click Visual Basic Projects, click Windows Application, and then click OK.
10. In Solution Explorer, right-click WindowsApplication1, and then click Set as Startup Project.
11. In the Toolbox in My User Controls, double-click UserControl1 to add the control to the form.
12. On the Build menu, click Build Solution.
13. On the Debug menu, click Start.
14. Click the TextBox control in the form to set the focus to it.
15. Click the Close button to close the form.

Note To close the form when you expected that this operation would be disabled, set the Cancel property to True in the Validating event.

For more information about validating Windows Forms, visit the following Microsoft Developer Network (MSDN) Web site:

http://msdn2.microsoft.com/en-us/library/aa983757(VS.71).aspx

For more information, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Additional query words: X

Keywords: kbqfe kbhotfixserver kbcontrol kbwindowsforms kbnetframe110presp2fix kbbug kbfix kbprb KB886686

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