FIX: Updates to Textbox Bound to Remote Data Control Fail with rdUseClientBatch

Updates to a TextBox control that is bound to a Remote Data control fail to update in certain instances. This behavior occurs when you use a cursor type of rdUseClientBatch and the BatchUpdate method is called before moving the cursor off the edited row.

There are several possible workarounds for this problem:

• Use a server-side cursor for your data access.
• Call the MoveNext method before calling BatchUpdate.
• Call the UpdateRow method before calling BatchUpdate.

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

Steps to Reproduce Behavior

The following code uses an ODBC Datasource named Pubs that connects to the Pubs database in SQL Server.

1. In Visual Basic, create a new Standard EXE project. Form1 is added to the project by default.
2. From the Project menu, click to select Components. From the list of available Components, select Microsoft Remote Data Control 6.0.
3. Place a Remote DataControl, a Textbox, and a CommandButton control onto Form1. MSRDC1, Text1, and Command1 are created by default.
4. Set the following properties for MSRDC1:
   DataSourceName: Pubs
   SQL: SELECT * From Titles
   CursorDriver: 3 - rdUseClientBatch
   LockType: 5 - rdConcurBatch
   Prompt: 1 - rdDriverNoPrompt
5. Set the following properties for Text1:
   DataSource: MSRDC1
   DataField: Title
6. Add the following code to Form1's Code Window:

   Option Explicit
   
   Private Sub Command1_Click()
   '   MSRDC1.UpdateRow
      MSRDC1.Resultset.BatchUpdate
      MSRDC1.Refresh
   End Sub
   					

7. Run the code. Change the value in Text1, click Command1, and note how the old value returns to the box. Uncomment the UpdateRow line of code, and note that the data remains in the box and is updated back to the database.