Mine

	PlaceHolder pwl=( PlaceHolder ) Page.FindControl ( "PHCartDetails" );
			//PlaceHolder pl=( PlaceHolder ) Page.FindControl ( "PHDetail" );
			Label	lbl=null;
			foreach ( Control ctl in pwl.Controls )
			{
				if ( ctl is Label )
				lbl=( Label ) ctl;
				
			}
			

foreach(object obj in ar)
{
 if(obj is Table)
  {
       Table oTable = (Table) obj;
       this.phCartDetails.Controls.Add(oTable);
  }

}