用户控件传参

Upload newWeb=new Upload();
   uploadfile=newWeb.unloadstr;
   if(Session["filename"]!=null) //用户控件中传来的参数
    /{uploadfile=Session["filename"].ToString();  DXTB1.Text=uploadfile; Session["filename"]=null;}
             
         if(uploadfile!=null)
   {   uploadfile=uploadfile.Trim();
    if(uploadfile!=string.Empty)
    {
     
      DXTB1.Text=uploadfile;
    }
   }