BUG: Invalid Operation After Setting RDC Resultset = Nothing (153017)

SYMPTOMS

Executing a refresh method against a remote data control after setting the RDC's Resultset property to Nothing can cause one of these errors:

"Invalid operation for forward only cursor"

-or-

"Unknown error or operation"

WORKAROUND

To avoid this problem, set the ResultsetType property to the valid value of 1 after setting the Resultset equal to Nothing. For example, the following code will work correctly and not cause any errors:

   Set MSRDC1.Resultset = Nothing
   MSRDC1.ResultsetType = 1
   MSRDC1.Refresh

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. Microsoft is researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

Steps To Reproduce Problem

Start Visual Basic 4.0. Form1 is created by default.
Add a single Remote Data control to Form1.

Add the following code to the form, making sure to change the OpenConnection parameters to match an existing data source.

Note You must change UID =<username> and PWD =<strong password> to the correct values before you run this code. Make sure that UID has the appropriate permissions to perform this operation on the database.

   Private Sub Form_Click()
      Dim cn As rdoConnection
        Dim rsTemp As rdoResultset

        Set cn = rdoEnvironments(0).OpenConnection("", rdDriverNoPrompt, _
         False, "DSN=MyDSN;database=pubs;uid=<username>;pwd=<strong password>;")
        Set rsTemp = cn.OpenResultset("Select * From Authors;", _
         rdOpenKeyset)
        Set MSRDC1.Resultset = rsTemp
        MSRDC1.Refresh
        Set MSRDC1.Resultset = Nothing
        MSRDC1.Refresh
   End Sub

Press the F5 key, or select Start from the Run menu to run the application. Click once on the form to execute the code and to see the error.