DOCUMENT:Q190607  09-JAN-2000  [vbwin]
TITLE   :PRB: DataEnvironment: DataReport Moves Form To EOF
PRODUCT :Microsoft Visual Basic for Windows
PROD/VER:
OPER/SYS:
KEYWORDS:kbGrpDSVBDB

======================================================================
-------------------------------------------------------------------------------
The information in this article applies to:

 - Microsoft Visual Basic Enterprise Edition for Windows, version 6.0 
-------------------------------------------------------------------------------

SYMPTOMS
========

When you have a DataReport and Form with controls bound to the same
DataEnvironment, opening the report causes the form to be blank.

CAUSE
=====

When the report steps through the records, it is moving the current position for
the DataEnvironment and stops when it reaches EOF (end-of- file). This becomes
the current position for the form, which displays blank fields.

RESOLUTION
==========

 - Open a second copy of the DataEnvironment in code and set the DataReport's
   DataSource property to this variable instead of the global DataEnvironment
   object.

-or-

 - Reset the record pointer from a timer event.

STATUS
======

This behavior is by design.

MORE INFORMATION
================

Steps to Reproduce Behavior
---------------------------

1. Create a new Visual Basic EXE project and add a form (Form1), DataEnvironment
   (DataEnvironment1), and DataReport (DataReport1).

2. In the DataEnvironment designer, add a connection (Connection1) to a
   database, such as Microsoft SQL Server.

3. Off the connection, create a command (Command1) that selects records from a
   table, such as SELECT * FROM Authors.

4. Save the DataEnvironment.

5. In the DataReport designer, set the following properties:

         DataSource: DataEnvironment1
         DataMember: Command1

6. Add some fields from the table and save the report.

7. Add some textboxes to the form and set the following properties:

         DataSource: DataEnvironment1
         DataMember: Command1
         DataField: choose from the fields in the table

8. Run the project. The form opens and displays the first record in the table.

9. Close the form and add the following code to it:

         Option Explicit

         Sub Form_Load ()
           DataReport1.Show
         End Sub

10. Run the project again. The DataReport opens and shows the records. When you
   switch to the form, it is blank. The DataReport has moved the cursor to the
   EOF position, so the form has not record to display.

Workaround 1
------------

1. Modify the form code as follows:

         Option Explicit

         Sub Form_Load ()
           Dim de As DataEnvironment1
           Set de = New DataEnvironment1
           Set DataReport1.DataSource = de
            DataReport1.Show
         End Sub

2. Run the project. The form is now correctly positioned to the first record
   because the DataReport is using a different instance of the DataEnvironment.

Workaround 2
------------

1. Add a Timer (Timer1) to the form and set the Interval property to 0.

2. Modify the form code as follows:

         Option Explicit

         Sub Form_Load ()
           DataReport1.Show
           Timer1.Interval = 1
         End Sub

         Sub Timer1_Timer ()
           DataEnvironment1.rsCommand1.MoveFirst
           Timer1.Interval = 0
         End Sub

3. Run the project. The form is now correctly positioned to the first record.
   The timer event does not fire until the DataReport has finished stepping
   through the records and so safely resets the record pointer. This does not
   affect the DataReport.

Additional query words: kbDSupport kbdse kbvbp600 kbVBp kbDataBinding

======================================================================
Keywords          : kbGrpDSVBDB 
Technology        : kbVBSearch kbAudDeveloper kbZNotKeyword6 kbZNotKeyword2 kbVB600Search kbVB600
Issue type        : kbprb

=============================================================================

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 2000.