FIX: A Windows Forms-based application may unexpectedly quit or you may receive NullReference exceptions during run time when based application uses the ErrorProvider control or the ToolTip control in the .NET Framework 1.1

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SYMPTOMS

In the Microsoft .NET Framework 1.1, when a Microsoft Windows Forms-based application contains forms that contain the ErrorProvider control or the ToolTip control, the application may unexpectedly quit or you may receive NullReference exceptions during run time. Typically, this problem occurs when the application is under heavy load.

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CAUSE

This problem occurs when the form that contains the ErrorProvider control or the ToolTip control is incorrectly disposed during form closing. The exception occurs when the form is re-created and appears again.

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RESOLUTION

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

To download this hotfix from the MSDN Code Gallery, visit the following Microsoft Web site:

http://code.msdn.microsoft.com/KB893005 (http://code.msdn.microsoft.com/KB893005)

Note The MSDN Code Gallery displays the languages for which the hotfix is available. If you do not see your language listed, it is because the Code Gallery resource page is not available for that language.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:

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

Prerequisites

The Microsoft .NET Framework 1.1 Service Pack 1

Restart requirement

You do not have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

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 tool in Control Panel.

   Date         Time   Version        Size       File name
   ----------------------------------------------------------------------
   26-Jan-2005  17:35  1.1.4322.2064  2,056,192  System.windows.forms.dll

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