PlaceHoder控件根据不同条件加载相应自定义控件

#region 根据UserCode加载相应控件
  public void CheckUserControl(string UserCode)
  {
   if( UserCode!="0" && UserCode!= null)
    {
     Control myControl = Page.LoadControl("modules//FriendHeadControl.ascx");
     this.PlaceHolder.Controls.Clear();
     this.PlaceHolder.Controls.Add(myControl);
    }
    else
    {
     Control myControl = Page.LoadControl("modules//FriendHead2UserControl.ascx");
     this.PlaceHolder.Controls.Clear();
     this.PlaceHolder.Controls.Add(myControl);
    }  
  }
  #endregion