Question

    For i As Integer = 0 To _rows.Count
        If (_rows(i).LeftOffset > largestOffset) Then
            largestOffset = _rows(i).LeftOffset
        End If
    Next i

    For i As Integer = 0 To _rows.Count

This code is never getting to the second for, I can put a breakpoint on the End If in there and it triggers for _rows.Count like it should, but then if there’s a breakpoint on the second for or anything after it it’s never reached. There’s no error message, the program doesn’t freeze or anything and it behaves exactly as if I had done:

    For i As Integer = 0 To _rows.Count
        If (_rows(i).LeftOffset > largestOffset) Then
            largestOffset = _rows(i).LeftOffset
        End If
    Next i

    Return

    For i As Integer = 0 To _rows.Count

Answer 1

It should be _rows.Count-1 as the upper bound. The last time round the loop will fail with an IndexOutOfRangeException.

I have found that in a few places in VB.net, especially in Form_Load, errors are not shown up by the debugger, and the Sub just exits silently, and the program continues. A try…catch block around it will catch an exception however.