Form_Paint: Invalid parameter used.

[rex64]

I am trying to do a Microsoft tutorial, and incorporate it into my software. I decided to start out just trying to get their tutorial to work, however it is not working.
http://www.microsoft.com/seminar/sha...est.xml&rate=1

An unhandled exception of type 'System.ArgumentException' occurred in system.windows.forms.dll

Additional information: Invalid parameter used.

Private Sub frmStudy_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles MyBase.Paint
        Dim canvas As Graphics = e.Graphics

        Dim expandingBox As New Rectangle(0, _
            0, _
            e.ClipRectangle.Width / 2, _
            e.ClipRectangle.Height / 2)

        Dim paintBrush As New LinearGradientBrush(expandingBox, _
            Color.White, Color.Blue, LinearGradientMode.ForwardDiagonal)

        canvas.FillRectangle(paintBrush, expandingBox)
        paintBrush.Dispose()
        canvas.Dispose()
    End Sub