FIX: Selecting a Nested UserControl DataSource Property May Cause Crash

View products that this article applies to.

This article was previously published under Q246233

SYMPTOMS

Visual Basic generates an Access Violation error when you select the DataSource property of a TextBox control that is placed on a UserControl. This only happens if the UserControl has been placed on a second UserControl in the same project. On computers that do not have Visual Studio Service Pack 3 installed, you may not get the Access Violation error. However, the control disappears. If you have a Data control on the UserControl that contains the TextBox, you always get the crash.

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RESOLUTION

To resolve this problem, install Visual Studio 6.0 Service Pack 4.

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STATUS

Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article. This bug was corrected in the latest service pack for Visual Studio 6.0.

For additional information about Visual Studio service packs, click the following article numbers to view the articles in the Microsoft Knowledge Base:

194022 (http://support.microsoft.com/kb/194022/EN-US/ ) INFO: Visual Studio 6.0 Service Packs, What, Where, Why

194295 (http://support.microsoft.com/kb/194295/EN-US/ ) HOWTO: Tell That a Visual Studio Service Pack Is Installed

To download the latest Visual Studio service pack, visit the following Microsoft Web site:

http://msdn2.microsoft.com/en-us/vstudio/Aa718353.aspx (http://msdn2.microsoft.com/en-us/vstudio/Aa718353.aspx)

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MORE INFORMATION

Steps to Reproduce Behavior

Create a new Standard EXE project in Visual Basic. Form1 is created by default.
From the Project menu, choose Add User Control to add a UserControl (UserControl1) to the project.
Place a TextBox and a Data control on UserControl1.

NOTE: The Access Violation also happens without the Data control on computers that have Visual Studio Service Pack 3.
Close UserControl1.
Add a second UserControl (UserControl2) to the project.
Place UserControl1 on UserControl2.
Close UserControl2 and Form1.
Open UserControl1.
Select Text1 on UserControl1, and, in the Properties window, click on the DataSource property. The control might disappear. If so, repeat the preceding two steps and Visual Basic generates the Access Violation error.