asp.net下载文件

string filePath=“”;//服务器文件路径

string fileName = "ExcelTest" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".xlsx";//客户端保存的文件名            System.IO.FileInfo fileInfo = new System.IO.FileInfo(filePath);            Response.Clear();            Response.ClearContent();            Response.ClearHeaders();            Response.AddHeader("Content-Disposition", "attachment;filename=" + fileName);            Response.AddHeader("Content-Length", fileInfo.Length.ToString());            Response.AddHeader("Content-Transfer-Encoding", "binary");            Response.ContentType = "application/octet-stream";            Response.ContentEncoding = System.Text.Encoding.GetEncoding("gb2312");            Response.WriteFile(fileInfo.FullName);            Response.Flush();            Response.End();