Initially I thought this was a good case for a suspendlayout - resumelayout(false) but I still got the flicker. Here is a solution that may not be exactly what you want but still looks professional. Add a timer - interval=1500. I found less than that would seem jumpy and the form would pop back on the mouse up and then jump back to the corrected position. I snipped the function signatures for aesthetics.

    Private Sub Form1_LocationChanged(...) Handles MyBase.LocationChanged
        tmrMove.Enabled = True
    End Sub

    Private Sub tmrMove_Tick(...) Handles tmrMove.Tick
        If Me.Left < 0 Then
            Me.Left = 0
            tmrMove.Enabled = False
        End If
    End Sub

>I have a MDI Parent/Child situation and I am trying to prevent my child form from moving it's left position to a negative. Same goes for the top position. I have achieved this via the following code:
>
>

>Private Sub frm_A_Users_Move(ByVal sender As Object, _
>        ByVal e As System.EventArgs) Handles MyBase.Move
>
>        Dim intLeft As Integer = Me.Left
>        Dim intTop As Integer = Me.Top
>
>        If intLeft < 0 Then Me.Left = 0
>        If intTop < 0 Then Me.Top = 0
>
>End Sub
>

>
>This works but the controls on the form will flicker when the form comes up against this boundry. How or where do I prevent this from happening?
>
>Jason