流读取中文乱码问题

public void download(string url)

{       

 

      FileInfo fi = new FileInfo(url);
       
        if (fi.Exists)
        {
            Response.Clear();
  

            Response.AddHeader("Content-Disposition", "attachment;filename=" + 

            Context.Server.UrlPathEncode(fi.Name));//防止输出乱码
            Response.AddHeader("Content-Length", fi.Length.ToString());   
           
            Response.Filter.Close();
            Response.WriteFile(fi.FullName);
            Response.End();
        }
        else
        {

        }

 

}