public class PdfHelper

     {

         static string RootPath

         {

             get

             {

                 string AppPath = "";

                 HttpContext HttpCurrent = HttpContext.Current;

                 if (HttpCurrent != null)

                 {

                     AppPath = HttpCurrent.Server.MapPath("~");

                 }

                 return AppPath.Trim(new char[]{'\\'});

             }

         }

         public static void GetPdf(HttpResponseBase response,string pdfUrl)

         {

             string fileName = Guid.NewGuid().ToString("N") + ".pdf";

             string filePath = RootPath + "\\pdfs\\" + fileName;

             string exePath=RootPath + "\\wkhtmltopdf\\wkhtmltopdf.exe";

             string args=pdfUrl + " --zoom 1.25 \"" + filePath+"\"";

             Process p =new Process();

             p.StartInfo.FileName = exePath;

             p.StartInfo.Arguments = args;

             p.StartInfo.UseShellExecute = false;

             p.StartInfo.RedirectStandardInput = true;

             p.StartInfo.RedirectStandardOutput = true;

             p.StartInfo.RedirectStandardError = true;

             p.StartInfo.CreateNoWindow = false;

             try

             {

                 p.Start();

                 p.WaitForExit();

                 p.StandardOutput.ReadToEnd();

                 p.Close();

                 FileStream fs = new FileStream(filePath, FileMode.Open);

                 byte[] file = new byte[fs.Length];

                 fs.Read(file, , file.Length);

                 fs.Close();

                 response.Clear();

                 response.AddHeader("content-disposition", "attachment; filename=" + fileName);

                 response.ContentType = "application/octet-stream";

                 response.BinaryWrite(file);

                 response.Flush();

             }

             catch

             {

             }

         }

     }