problem at the time of downloading a pdf file.

venderprint pdfForm = new venderprint(GetTable(), Server.MapPath("~/images/logopdf.png"));

            // Create a MigraDoc document
            Document document = pdfForm.CreateDocument();
            document.UseCmykColor = true;

            // Create a renderer for PDF that uses Unicode font encoding
            PdfDocumentRenderer pdfRenderer = new PdfDocumentRenderer(true);

            // Set the MigraDoc document
            pdfRenderer.Document = document;


            // Create the PDF document
            pdfRenderer.RenderDocument();

            // Save the PDF document...
            string filename = "VendorInformation.pdf"; 
            pdfRenderer.Save(Server.MapPath("~/File/"+filename));
            Process.Start(Server.MapPath("~/File/" + filename));