[asp.net教程] 下载文件出现提示框或者直接显示在浏览器中

有个朋友问我下载弹出提示框的写法，具体如下：
   
  出现提示框
   
  string strfile="f:\\a.doc";//路径根据实际情况而定
  if(!system.io.file.exists(strfile))
   {
   response.write("<script language='javascript'>alert('对不起，文件不存在！');</script>");
   return;
   }
   response.clear();
   response.clearheaders();
   response.charset = "gb2312";
   response.contentencoding =system.text.encoding.utf8;
   response.contenttype = "application/octet-stream";
   fileinfo fi=new fileinfo(strfile);
   response.addheader("content-disposition","attachment; filename=" + httputility.urlencode(fi.name)) ;

   response.addheader("content-length",fi.length.tostring());
   byte[] tmpbyte=new byte[1024*8];
   filestream fs=fi.openread();
   int count;
   while((count=fs.read(tmpbyte,0,tmpbyte.length))>0)
   {
   response.binarywrite(tmpbyte);
   response.flush();
   }
   fs.close();
   response.end();
   
  直接在浏览器中打开
   string strfile="f:\\a.doc";//路径根据实际情况而定
   response.clear();
   response.clearheaders();
   response.charset = "gb2312";
   response.contentencoding =system.text.encoding.utf8;
   response.contenttype = "application/msword";
   response.writefile(strfile);
   
  http://www.cnblogs.com/skylaugh/archive/2006/12/18/596074.html