Response.Redirect to HTTPS pages

I am adding ssl to a site that never had it. I can get it to work but  I need to be able to test my code on a test server which doesn't have ssl. So I was thinking of checking a variable and depending  on it's value I would redirect to a http or a https.
   
I am using this code that works fine to non secure pages.
Response.Redirect("~/Orders/Order Form.aspx")

What I want to do is this
If GetUsesSSL = "Yes" Then
              'This is the none secure site
                Response.Redirect("~/Orders/Order Form.aspx")
                Exit Sub
Else
               'This is the secure site
                Response.Redirect("https://" & "~/Orders/Order Form.aspx")
                Exit Sub
End If

What is the syntax to use the existing directory with https: ?