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Asked: 2026-05-11T07:14:03+00:00

I have a DGV in VB.Net 2008 connected to an Access DB table. The

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I have a DGV in VB.Net 2008 connected to an Access DB table. The DGV is not Read Only, but is full of read-only columns except for one, which contains a combo box. The combo box allows the user to select an outcome for that particular row, and then the program copies in a pre calculated value into the ‘Profit’ column depending upon the item selected in the combobox. Then the user hits the Save button and the DB updates (currently via SQL methods in the XSD).

Easy enough so far.

Here is the code.

Private Sub DGUserBets_EditingControlShowing(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewEditingControlShowingEventArgs) Handles DGUserBets.EditingControlShowing      Dim combo As ComboBox = CType(e.Control, ComboBox)      If (combo IsNot Nothing) Then           // Remove an existing event-handler, if present, to avoid           // adding multiple handlers when the editing control is reused.         RemoveHandler combo.SelectedIndexChanged, _             New EventHandler(AddressOf DGUBStake_SelectedIndexChanged)          // Add the event handler.          AddHandler combo.SelectedIndexChanged, _             New EventHandler(AddressOf DGUBStake_SelectedIndexChanged)      End If  End Sub   Private Sub DGUBStake_SelectedIndexChanged(ByVal sender As Object, ByVal e As EventArgs)      Dim myStatus As ComboBox = CType(sender, ComboBox)      Dim row = DGUserBets.CurrentRow      Select Case myStatus.SelectedIndex         Case 0             row.Cells('DGUBProfit').Value = 0             // pending. no action         Case 1             row.Cells('DGUBProfit').Value = row.Cells('DGUBIfWin').Value             // win         Case 2             // loses             row.Cells('DGUBProfit').Value = row.Cells('DGUBIfLose').Value         Case 3             // void             row.Cells('DGUBProfit').Value = 0     End Select   End Sub

The problem I have is that it would seem that if a user selects the desired outcome from the combobox but does NOT hit Enter, and simply mouses on to a different combobox to again select the outcome for a different row, the first eventhandler is not disconnected and thus the events fire multiple times. This then causes various default MsgBox errors and brings up problems when the user tries to commit all changes to the DB/exit program etc etc.

What do I need to do? Do I need to .EndEdit somewhere appropriate to force the row to save the changes? And where should I call this?

Thank you.

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1 Answer

  1. A quick glance at the code brings up this question: If you create a new EventHandler when removing the existing one is it the same one?

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