PDFsharp & MigraDoc Foundation

        Dim stream As New MemoryStream()
        pdf.Save(stream, False)
        Response.Clear()
        Response.ContentType = "application/pdf"
        Response.AddHeader("Accept-Header", stream.Length.ToString())
        Response.AddHeader("content-length", stream.Length.ToString())
        Dim filename As String
        filename = "test.pdf"
        Response.AddHeader("Content-Disposition", "attachment;filename=" & filename)
        Response.OutputStream.Write(stream.GetBuffer(), 0, stream.Length)
        Response.Flush()
        stream.Close()
        Response.End()