DataTable internal index is corrupted

Question

I am working with a .NET WinForms app in C#, running against the 3.5 .NET framework. In this app, I am setting the .Expression member of a DataColumn in a

Answer 1

I resolved my datatable-internal-index error this way:

changed CellEndEdit to CellBeginEdit event. Also... avoid using NULLs unnecessarily:

Private Sub User_role_groupDataGridView_CellBeginEdit(sender As Object, e As DataGridViewCellCancelEventArgs) Handles User_role_groupDataGridView.CellBeginEdit
    Try 
        If Not Me.User_role_groupDataGridView.Rows(e.RowIndex).IsNewRow Then Me.User_role_groupDataGridView.Rows(e.RowIndex).Cells("last_modified_user_group_role").Value = Now
    Catch ex As Exception
        Me.displayUserMessage(ex.ToString, Me.Text, True)
    End Try
End Sub