Response.AddHeader("Content-Disposition", "attachment; filename=ht.rar");
Response.ContentType = "application/octet-stream";
///Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
Response.TransmitFile("C://ht.rar");
Response.ContentType = "application/octet-stream";
///Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
Response.TransmitFile("C://ht.rar");