ASP.NET(C#)下载图片代码

Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/-->try
             {
                 string FullFileName = Server.MapPath(@"/images/imgname.jpg"); //FileName--要下载的文件名 
                 System.IO.FileInfo DownloadFile = new System.IO.FileInfo(FullFileName);
                 if (DownloadFile.Exists)
                 {
                     Response.Clear();
                     Response.ClearHeaders();
                     Response.Buffer = false;
                     Response.ContentType = "application/octet-stream";
                     Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(DownloadFile.Name, System.Text.Encoding.ASCII));
                     Response.AppendHeader("Content-Length", DownloadFile.Length.ToString());
                     Response.WriteFile(DownloadFile.FullName);
                     Response.Flush();
                     Response.End();
                 }
                 else
                 {
                     //文件不存在 
                 }
             }
             catch
             {
                 //文件不存在
             }