Knowledge Base

DOC: Unbndgrd Sample App Updates Wrong Row

Article ID: 185886

Article Last Modified on 10/30/2003

APPLIES TO

This article was previously published under Q185886

SUMMARY

This example is designed to demonstrate how to use the DBGrid control in an unbound state. There is an error in the code for this example that can cause strange results to occur when editing data in the example's DBGrid control. Data that has been changed may appear to revert to previous values, or changes entered in one row may be updated in another.

MORE INFORMATION

This situation has the potential to create a variety of problems. You should implement the change to the sample code regardless of the behavior you are seeing.

Resolution

  1. Open the code module for the Unbndgrd example's form.
  2. Locate the subroutine DBGrid1_UnboundReadData.
  3. In the subroutine, find the line of code that reads: 
          CurRow& = RowBuf.RowCount - 1
  4. Change the line of code to the following: 
          CurRow& = UBound(UserData, 2)
  5. The example should now function properly.

Steps to Reproduce Behavior

  1. Start Visual Basic (VB) and open the Unbndgrd.vbp sample project. (From the VB directory go to \samples\Misc\UnBndGrd\Unbndgrd.VBP.)
  2. Run the project.
  3. Scroll the DBGrid down to the last row.
  4. Modify one of the cells.
  5. Click any row (except the last one) to update the grid.
  6. Note that the data reverts to its previous value.
  7. Scroll the DBGrid to the first row.
  8. Note that the changes appear in the first row.
This problem occurs only if the last row of the DBGrid is the first row to be edited. After any other row has been edited, the DBGrid behaves correctly.

Additional query words: kbDSupport kbDSD kbCtrl

Keywords: KB185886


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