BUG: Application Error Occurs When Rebinding a Bound DBGrid

• Microsoft Visual Basic Professional and Enterprise Editions, 32-bit only, for Windows, version 4.0
• Microsoft Windows NT 3.51

SYMPTOMS

An application error occurs when a Visual Basic 32-bit program with a DBGrid control bound to a Data control rebinds the Data control to a recordset containing at least 26 fields and 11 records.

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

The code example provides steps to reproduce this behavior. In this example, create a form containing a command button, data control, and a DBGrid control. Set the DataSource property of the DBGrid control to the data control. After copying the code to the Form1 code window, run the program and click any row in the DBGrid control except the first row. Click the Command1 button to swap the recordsets. An application error occurs.

Steps to Reproduce Problem

1. Start the 32-bit version of Visual Basic 4.0, or if it is already running, click New Project on the File menu.



2. Add a command button, data control, and a DBGrid control on the Form1 form.



3. Use the following steps to set the DataSource property of the DBGrid control to Data1.
   
   
   1. Click the DBGrid control on the Form1 form.
   
   
   
   2. In the Properties Window, click the DataSource property.
   
   
   
   3. In the DataSource Property, click the down arrow. The Data1 option appears. Click this option.
   
   
   



4. Copy the following code sample to the Form1 code window:

   
         Dim rs1 As Recordset
         Dim rs2 As Recordset
         Dim db As Database
         Dim td As TableDef
         Dim fl As Field
   
         Private Sub Command1_Click()
            Set Data1.Recordset = rs2
            Set Data1.Recordset = rs1
         End Sub
   
         Private Sub Form_Load()
         Dim x As Integer, y As Integer
   
         'If the database does not exist, create the database
         If Dir("C:\TEST.MDB") = "" Then
            Set db = CreateDatabase("C:\test.mdb", dbLangGeneral)
   
            'Create the table in the database
            Set td = db.CreateTableDef("TABLE1")
   
            'Create the fields in the database
            For x = 1 To 26
               Set fl = td.CreateField("Field " & CStr(x), dbInteger)
               td.Fields.Append fl
            Next x
            db.TableDefs.Append td
   
            'Add records to the database through a recordset
            Set rs1 = db.OpenRecordset("TABLE1", dbOpenTable)
            For y = 1 To 11      'For each row
               rs1.AddNew        'Add a new record
   
               For x = 1 To 26   'For each cell in the record
                  rs1("Field " & CStr(x)) = x   'Add a number
               Next x
   
               rs1.Update
            Next y
   
            'Close both the recordset and database
            rs1.Close
            db.Close
         End If
   
         'Open the database and create the recordsets
         Set db = OpenDatabase("C:\TEST.MDB")
         Set rs1 = db.OpenRecordset("Select * From TABLE1")
         Set rs2 = db.OpenRecordset("Select * From TABLE1")
         Set Data1.Recordset = rs1
   
         End Sub 




5. Press the F5 key or click Start on the Run menu to run the program.



6. Click on any row on the DBGrid control except the first row.



7. Click on the Command1 button to swap the recordsets. An application error occurs and Visual Basic ends.

Additional query words: 4.00 vb4win vb432 buglist4.00

Keywords : PrgCtrlsCus
Version : 4.00
Platform : NT WINDOWS
Issue type :