FIX: ADO AddNew After a Trap for EOF Does Not Correctly Bind Control

ID: Q223063

The information in this article applies to:

Microsoft Visual Basic Professional and Enterprise Editions for Windows, version 6.0

SYMPTOMS

When you add a new row in the EndofRecordset Event of an ADO recordset, the first field updated in the recordset will not bind properly with its control. The control does not appear to get the new value.

CAUSE

This problem is caused by the Data Binding Manager not correctly tracking the current record in the recordset.

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 Visual Studio 6.0 Service Pack 3.

For more information about Visual Studio 6.0 Service Packs, please see the following articles in the Microsoft Knowledge Base:

Q194022 INFO: Visual Studio 6.0 Service Packs, What, Where, Why

Q194295 HOWTO: Tell That Visual Studio 6.0 Service Packs Are Installed

MORE INFORMATION

The EndOfRecordset event is raised when there is an attempt to move to a row past the end of the recordset. You can add new records to a recordset in the EndOfRecordset event. Before EndOfRecordset returns, add your data, then set the fMoreData parameter to True to indicate that there is a new end to the Recordset.

Steps to Reproduce Behavior

Start Visual Basic 6.0.

Select the Standard EXE Project.

Set the following Project Reference:
```
Microsoft ActiveX Data Objects 
```

Add the following controls to the default form:
```
2 Text boxes
1 Command button 
```

Paste the following code into the default form:


Private WithEvents rs As ADODB.Recordset
Private counter As Integer

Private Sub Form_Load()
   
   'Create a new empty recordset, with 2 fields    
   Set rs = New ADODB.Recordset
    
   rs.Fields.Append "Field0", adBSTR, 20
   rs.Fields.Append "Field1", adBSTR, 20
   rs.Open
   
   counter = 0
   rs.MoveLast
   
   'Bind the 2 text boxes to the 2 recordset fields   
   Text1.DataField = "Field0"
   Text2.DataField = "Field1"
   
   Set Text1.DataSource = rs
   Set Text2.DataSource = rs
   
End Sub

Private Sub rs_EndOfRecordset(fMoreData As Boolean, _
                              adStatus As ADODB.EventStatusEnum, _
                              ByVal pRecordset As ADODB.Recordset)
   
   'The same counter value is assigned to both fields
   counter = counter + 1
   pRecordset.AddNew
   pRecordset(0) = "Field 0 counter: " & CStr(counter)
   pRecordset(1) = "Field 1 counter: " & CStr(counter)
   pRecordset.Update
     
   'Set fMoreData to True, indicating a new end of the recordset     
   fMoreData = True
     
End Sub
   
Private Sub Command1_Click()
     
    '  Although the same counter is assigned to Field0 and Field1,     
    '     Text1 lags behind Text2
    rs.MoveNext   
     
End Sub

Run the Project

As you click Command1, note how the Text1 value lags the Text2 value.

REFERENCES

Additional query words:


Keywords          : kbservicepack kbVBp600 kbVS600sp3 kbVS600sp3fix kbGrpVBDB 
Version           : WINDOWS:6.0
Platform          : WINDOWS 
Issue type        : kbbug

Last Reviewed: May 19, 1999