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Passing through an ASPX file to get a file on a server ? (Webforms)
Response.Clear();
Response.ContentType = "application/octet-stream";
Response.HeaderEncoding = Response.ContentEncoding;

Response.AppendHeader("content-disposition",
    String.Format(CultureInfo.InvariantCulture,
    "attachment; filename="{0}"", yourFileName));
Response.AppendHeader("content-length",
    yourFileSize.ToString(CultureInfo.InvariantCulture));

Response.TransmitFile(yourFilePath);
Response.End();