Microsoft KB Archive/884579

= FIX: The Click event for a button in a UserControl control occurs even though another UserControl control is set to cancel form validation in a Microsoft Windows Forms application that is built on the Microsoft .NET Framework 1.1 =

Article ID: 884579

Article Last Modified on 8/23/2006

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APPLIES TO


 * Microsoft .NET Framework 1.1

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SYMPTOMS
When you click a button in a UserControl control in a Microsoft Windows Forms application that is built on the Microsoft .NET Framework 1.1, the Click event for the button occurs even though another UserControl control is set to cancel form validation.



CAUSE
This problem occurs because of the way events are processed and because of the way validation occurs for controls that are in focus in Windows Forms applications.



RESOLUTION
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites
The following list contains prerequisites for the hotfix:
 * Microsoft .NET Framework 1.1

Restart Requirement
You must restart your computer after you apply this hotfix.

Hotfix Replacement Information
This hotfix does not replace any other hotfixes.

Hotfix File Information
The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
For example, consider the following scenario:
 * The form contains a UserControl control that is named UserControlA and a UserControl control that is named UserControlB.
 * UserControlA contains a TextBox control. The CancelEventArgs.Cancel property is set to True in the Validating event of the TextBox control.
 * UserControlB contains a Button control. An implementation of the Click event is provided for the Button control.
 * When you run the application, you set the focus to the TextBox control in the UserControlA control. Then, you click the Button control in the UserControlB control.

In this scenario, the Click event for the Button control in UserControlB occurs, even though you set the CancelEventArgs.Cancel property to True. The CancelEventArgs.Cancel property is in the Validating event of the TextBox control for the UserControlA control.

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

Keywords: kbfix kbhotfixserver kbqfe kbpubtypekc KB884579

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