asp.net文件下载

protected void Button1_Click(object sender, EventArgs e)
    {
        this.DownLoadFile("12.txt");
    }

    //下载函数
    private void DownLoadFile(string fileName)
    {  
        string filePath = Server.MapPath(".") + "\\" + fileName;
        if (File.Exists(filePath))
        {
            FileInfo file = new FileInfo(filePath);
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8"); //解决中文乱码
            Response.AddHeader("Content-Disposition", "attachment; filename=" + Server.UrlEncode(file.Name)); //解决中文文件名乱码    
            Response.AddHeader("Content-length", file.Length.ToString());
            Response.ContentType = "appliction/octet-stream";
            Response.WriteFile(file.FullName);
            Response.End();
        }
    }