aspx to pdf

Hello,

Please examine the code below.  I am overriding the Render method of my web page to generate a pdf copy of our aspx page.  It works great, except I am getting a 1.5" margin on the right, a 1.25" margin on the left, a 1" margin on the top and a big margin on the bottom.  There are no margin problems with the Words library, but isn't working so well with the PDF.  Please advise.

protected override void Render(HtmlTextWriter output)
{           
            // Get HTML of the page
            System.IO.StringWriter oStringWriter = new StringWriter();
            System.Web.UI.HtmlTextWriter oHtmlTextWriter = new HtmlTextWriter(oStringWriter);

            base.Render(oHtmlTextWriter);
            StringReader reader = new StringReader(oStringWriter.ToString());
            MemoryStream stream = new MemoryStream(System.Text.Encoding.UTF8.GetBytes(reader.ReadToEnd()));

            HtmlLoadOptions htmloptions = new HtmlLoadOptions();                      
            Aspose.Pdf.Document docp = new Aspose.Pdf.Document(stream, htmloptions);                      

            Aspose.Pdf.MarginInfo marginInfo = new Aspose.Pdf.MarginInfo();
            marginInfo.Top = ConvertUtil.InchToPoint(0.5);
            marginInfo.Bottom = ConvertUtil.InchToPoint(0.5);
            marginInfo.Left = ConvertUtil.InchToPoint(0.5);
            marginInfo.Right = ConvertUtil.InchToPoint(0.5);

            docp.PageInfo.Margin = marginInfo;                
            docp.PageLayout = PageLayout.OneColumn;
           
            docp.Save(Response, "filename.pdf", Aspose.Pdf.ContentDisposition.Attachment, new PdfSaveOptions());

}

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Thanks in advance for any and all consideration.