DOCUMENT:Q246233 26-JUL-2001 [vbwin] TITLE :FIX: Nested UserControl DataSource Property Causes Crash PRODUCT :Microsoft Visual Basic for Windows PROD/VER:WINDOWS:6.0 OPER/SYS: KEYWORDS:kbCtrlCreate kbVBp kbVBp600bug kbGrpDSVB kbDSupport kbVS600sp4fix kbVS600sp5fix ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Visual Basic Learning Edition for Windows, version 6.0 - Microsoft Visual Basic Professional Edition for Windows, version 6.0 - Microsoft Visual Basic Enterprise Edition for Windows, version 6.0 ------------------------------------------------------------------------------- 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. RESOLUTION ========== To resolve this problem, install Visual Studio 6.0 Service Pack 4. STATUS ====== Microsoft has confirmed this to be a bug in the Microsoft products 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 article numbers below to view the articles in the Microsoft Knowledge Base: Q194022 INFO: Visual Studio 6.0 Service Packs, What, Where, Why Q194295 HOWTO: Tell That a Visual Studio Service Pack Is Installed You can download the latest Visual Studio service pack from the following Microsoft Web site: Visual Studio Product Updates (http://msdn.microsoft.com/vstudio/downloads/updates.asp) MORE INFORMATION ================ Steps to Reproduce Behavior --------------------------- 1. Create a new Standard EXE project in Visual Basic. Form1 is created by default. 2. From the Project menu, choose Add User Control to add a UserControl (UserControl1) to the project. 3. 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. 4. Close UserControl1. 5. Add a second UserControl (UserControl2) to the project. 6. Place UserControl1 on UserControl2. 7. Close UserControl2 and Form1. 8. Open UserControl1. 9. 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. Additional query words: sp4 ====================================================================== Keywords : kbCtrlCreate kbVBp kbVBp600bug kbGrpDSVB kbDSupport kbVS600sp4fix kbVS600sp5fix Technology : kbVBSearch kbAudDeveloper kbZNotKeyword6 kbZNotKeyword2 kbVB600Search kbVB600 Version : WINDOWS:6.0 Issue type : kbbug Solution Type : kbfix ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2001.