UPDATE:
I have been playing around with all day and I am getting really close...
The below is what I have implemented, but I have discovered I am still able to populate a row without an Employee or Code if a use the Tab key
Private Sub gv_Data_ValueChanging(sender As Object, e As ValueChangingEventArgs) Handles gv_Data.ValueChanging If gv_Data.CurrentColumn.Name = "EmployeeID" Then Dim currentValue = e.NewValue For Each item In gv_Data.Rows If item Is gv_Data.CurrentRow Then Continue For End If If String.IsNullOrEmpty(item.Cells("EmployeeID").Value.ToString) = False Then If DirectCast(currentValue, Guid) = DirectCast(item.Cells("EmployeeID").Value, Guid) Then e.Cancel = True MessageBox.Show("Cannot duplicate employee on the Job Crew") Exit For End If End If Next item End If End Sub Private Sub gv_Data_RowValidating(sender As Object, e As RowValidatingEventArgs) Handles gv_Data.RowValidating ' CLEAR ANY CURRENT GUI INDICATION OF ROW ERROR e.Row.ErrorText = String.Empty ' STOP VALIDATION IF THE ESCAPE KEY WAS PRESSED If quitValidating = True Then quitValidating = False Return End If ' PERFORM THE VALIDATIONS If e.Row IsNot Nothing AndAlso e.Row.Cells(1).Value Is Nothing Then e.Row.ErrorText = "Employee selection is required" e.Cancel = True End If If e.Row IsNot Nothing AndAlso e.Row.Cells(2).Value Is Nothing Then e.Row.ErrorText = "Pay Code is required" e.Cancel = True End If End Sub Private Sub gv_Data_PreviewKeyDown(sender As Object, e As PreviewKeyDownEventArgs) Handles gv_Data.PreviewKeyDown ' CONTROL THE ROW VALDATION If e.KeyData = Keys.Escape Then quitValidating = True End If End Sub
So again, what am I missing?