ASP.Net 循环处理上传文件

private System.Boolean SaveImages() {
   //循环处理上传文件
   System.Web.HttpFileCollection _files = System.Web.HttpContext.Current.Request.Files;
   //用户UI信息
   System.Text.StringBuilder _message = new System.Text.StringBuilder("文件上传：<br>");
   try
   {
    for ( System.Int32 _iFile = 0; _iFile < _files.Count; _iFile ++ )
    {
     //检查上传文件的类型，默认有gif和jpg
     System.Web.HttpPostedFile _postedFile = _files[_iFile];
     System.String _fileName, _fileExtension; 
     _fileName = System.IO.Path.GetFileName(_postedFile.FileName);
     _fileExtension = System.IO.Path.GetExtension(_fileName);
     if ( _fileExtension == ".gif" )
     {
                     //保存文件的相对路径
      _postedFile.SaveAs(System.Web.HttpContext.Current.Request.MapPath("gifs/") + _fileName);
      _message.Append(_fileName + "<BR>");
     }
     else if ( _fileExtension == ".jpg" )
     {
                        //保存文件的相对路径
                        _postedFile.SaveAs(System.Web.HttpContext.Current.Request.MapPath("jpgs/") + _fileName);
      _message.Append(_fileName + "<BR>");
     }
     else
                    {
         _message.Append(_fileName + " <font color=/"red/">失败！只能上传GIF和JPG图片。</font><BR>");
     }
    }
    Label1.Text = _message.ToString();
    return true;
   }
   catch ( System.Exception Ex )
   {
    Label1.Text = Ex.Message ;
    return false;   
   }
  }