Download file from webpage without showing file URL

THis code sample shows how you can allow visitors to download a file from the webpage without exposing the path or hyperlink of the file.

if (filename != “”)
{
          string path = Server.MapPath(filename);
          System.IO.FileInfo file = new System.IO.FileInfo(path);
          if (file.Exists)
          {
                   Response.Clear();
                   Response.AddHeader(“Content-Disposition”, “attachment; filename=” + file.Name);
                   Response.AddHeader(“Content-Length”, file.Length.ToString());
                   Response.ContentType = “application/octet-stream”;
                   Response.WriteFile(file.FullName);
                   Response.End();
          }
          else
          {
                   Response.Write(“This file does not exist.”);
          }
}