ASP.NET

<br />
    private void SendKeyFile()<br />
    {<br />
      string root = "C:\\temp\\";<br />
      string filepath = root + "debug.txt";<br />
      if (!(filepath == null))<br />
      {<br />
        if (File.Exists(filepath) && filepath.StartsWith(root))<br />
        {<br />
          string filename = Path.GetFileName(filepath);<br />
          Response.Clear();<br />
          Response.ContentType = "application/octet-stream";<br />
          Response.AddHeader("Content-Disposition", ("attachment; filename=\"" + (filename + "\"")));<br />
          Response.Flush();<br />
          Response.WriteFile(filepath);<br />
        }<br />
      }<br />
    }<br />