protected void Page_PreRender(object sender, EventArgs e)
 {
     if (!WeekListChecked)
     {
         // Initialize week and weekend selectors
         WeekDays.ClearSelection();
         foreach (ListItem li in WeekDays.Items)
         {
             li.Selected = true;
         }
         WeekEnd.ClearSelection();
         foreach (ListItem li in WeekEnd.Items)
         {
             li.Selected = true;
         }
     }
 }
    protected override void OnPreRender(EventArgs e)
    {
        base.OnPreRender(e);

        if (!WeekListChecked)
        {
            // Initialize week and weekend selectors
            WeekDays.ClearSelection();
            foreach (ListItem li in WeekDays.Items)
            {
                li.Selected = true;
            }
            WeekEnd.ClearSelection();
            foreach (ListItem li in WeekEnd.Items)
            {
                li.Selected = true;
            }
        }
    }