Save SSRS Report as .PDF in Client Machine

You can use below snippet.

 string strURL=path;
         WebClient req=new WebClient();
         HttpResponse response = HttpContext.Current.Response;
         response.Clear();
         response.ClearContent();
         response.ClearHeaders();
         response.Buffer= true;
         response.AddHeader("Content-Disposition","attachment;filename=\"" + Server.MapPath(strURL) + "\"");
         byte[] data=req.DownloadData(Server.MapPath(strURL));
         response.BinaryWrite(data);
         response.End();

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Bala