VB10 Form width in inches

How can I set the width of a form in inches (or cm) instead of pixels?

I want to print the form, so it needs to always be the same dimensions (4" by 6"). I saw some examples for previous versions of VB, but nothing that works in VB10.

Thanks,
Alex

here's how to set it in inches:

vb Code:

Public Class Form1
 
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim gr As Graphics = Me.CreateGraphics
        Me.SetClientSizeCore(CInt(4 * gr.DpiX), CInt(6 * gr.DpiY)) '4 by 6 (w by h)
    End Sub
 
End Class

for cm: 1 inch = 2.54 cm

Thanks!