C#下载文件
string path = Server.MapPath("~/Upload/");
string FileName = dt.Rows[0]["Files"].ToString();
string filePath = path + FileName;
if (File.Exists(filePath))
{
FileInfo file = new FileInfo(filePath);
Response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8");
Response.AddHeader("Content-Disposition", "attachment; filename=" + Server.UrlEncode(file.Name));
Response.AddHeader("Content-length", file.Length.ToString());
Response.ContentType = "appliction/octet-stream";
Response.WriteFile(file.FullName);
Response.End();
}