Gerry Heidenreich

private void Page_Load(object sender, System.EventArgs e)
{
   string path = Server.MapPath(Request.Params["File"]);

   System.IO.FileInfo file = new System.IO.FileInfo(path);

   //clear the current output content from the buffer
   Response.Clear();

   //add the header that specifies filename for the download/saveas dialog
   Response.AddHeader("Content-Disposition","attachment; filename=" + file.Name);

   //add header that specifies size so the browser will show a progress bar
   Response.AddHeader("Content-Length", file.Length.ToString());

   //Set contenttype so client knows to only download file
   Response.ContentType="application/octet-stream";

   //send the file
   Response.WriteFile(file.FullName);