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string destFileName = "ok.txt";
            destFileName = Server.MapPath(".") + "\\"+destFileName;
            destFileName = Server.UrlDecode(destFileName);
            if (File.Exists(destFileName))
            {
                FileInfo fi = new FileInfo(destFileName);
                Response.Clear();
                Response.ClearHeaders();
                Response.Buffer = false;
                Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(Path.GetFileName(destFileName), System.Text.Encoding.UTF8));
                Response.AppendHeader("Content-Length", fi.Length.ToString());
                Response.ContentType = "application/octet-stream";
                Response.WriteFile(destFileName);
                Response.Flush();
                Response.End();
            }
            else
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Page.Response.Clear();
bool success = ResponseFile(Page.Request, Page.Response, "Ä¿µÄÎļþÃû³Æ", @"Ô´Îļþ·¾¶", 1024000);
if (!success) Response.Write("ÏÂÔØÎļþ³ö´í£¡"); Page.Response.End();
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