asp.net 下载文件

       //源文件名称

       //提供下载的文件，不编码的话文件名会乱码    

        //private string fileName = HttpContext.Current.Server.UrlEncode("规范.rar");   

        string fileName = @"D:\我的文档\Visual Studio 2010\WebSites\WebSite14\a00.zip";   

        FileInfo info = new FileInfo(fileName);

        long fileSize = info.Length;

        Response.Clear();

        Response.ContentType = "application/octet-stream";

        Response.AddHeader("Content-Disposition", "attachement;filename=" + "您希望显示的文件名称.rar"); //这里的文件名称也应该编码

        //指定文件大小   

        Response.AddHeader("Content-Length", fileSize.ToString());

        Response.WriteFile(fileName, 0, fileSize);

        Response.Flush();

        Response.Close();