C#绑定事件及下载文件

绑定事件

//Page_Load事件 
        protected void Page_Load(object sender, EventArgs e)
        {
     　　　　this.btnDownload.Click += new EventHandler(btnDownload_click);
        }
        
        //下载模板
        protected void btnDownload_click(object sender, EventArgs e)
        {
            TransmitFile("/uploads/Salary/SalaryTable.xlsx");
        }        

        /// <summary>
        /// 使用微软的TransmitFile下载文件
        /// </summary>
        /// <param name="filePath">服务器相对路径</param>
        public void TransmitFile(string filePath)
        {
            try
            {
                filePath = Server.MapPath(filePath);
                if (File.Exists(filePath))
                {
                    FileInfo info = new FileInfo(filePath);
                    long fileSize = info.Length;
                    HttpContext.Current.Response.Clear();

                    //指定Http Mime格式为压缩包
                    HttpContext.Current.Response.ContentType = "application/x-zip-compressed";

                    // Http 协议中有专门的指令来告知浏览器, 本次响应的是一个需要下载的文件. 格式如下:
                    // Content-Disposition: attachment;filename=filename.txt
                    HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment;filename=" + Server.UrlEncode(info.FullName));
                    //不指明Content-Length用Flush的话不会显示下载进度   
                    HttpContext.Current.Response.AddHeader("Content-Length", fileSize.ToString());
                    HttpContext.Current.Response.TransmitFile(filePath, 0, fileSize);
                    HttpContext.Current.Response.Flush();
                }
            }
            catch
            { }
            finally
            {
                HttpContext.Current.Response.Close();
            }

        }

某博客：http://www.cnblogs.com/wang7/archive/2012/08/07/2627298.html