Código:
Imports System.IO
Imports System.Web
Imports System.Web.UI
Dim popupScript As String = "<script language='JavaScript'>" & _
"window.open('" & ruta & "', 'CustomPopUp', " & _
"'width=200, height=200, menubar=yes, resizable=no')" & _
"</script>"
Me.RegisterStartupScript("PopupScript", popupScript)

