Do you get path when you clicks on download.
if yes, then following code to download file
You need to take help of
System.web.webclient. here is code
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(FilePath) + "\"");
byte[] data=req.DownloadData(Server.MapPath(FilePath));
response.BinaryWrite(data);
response.End();
it will prompt for saving file.