[2005] textbox Focus

I want to move the "focus" when user press up down left right.
I write the following code in keydown event.
But it can't work. The left and right has no problem, however, up and down can't work.

VB Code:

Select Case e.KeyCode
            Case Keys.Up
                If x > 1 Then
                    x -= 1
                End If
            Case Keys.Down
                If x < 9 Then
                    x += 1
                End If
            Case Keys.Right
                If y < 9 Then
                    y += 1
                End If
            Case Keys.Left
                If y > 1 Then
                    y -= 1
                End If
        End Select
arrtextbox(x, y).Focus()

Could i just clear something up. Am i right in assuming that you have a 9x9 grid and you have each 'square' in this grid as a textbox?

yes 9X9 = 81

Have you tried doing some sort of output when them keys are pressed to check that that section of code is being reached by the program. So jus put a message box in each of the case events that don't appear to be working.