public void ClearSelection()
 {
     CheckBoxListItems.ClearSelection();
     chkSelectAll.Checked = false;
     if (!UseInHeader)
     {
         Css_CollapseExpand_td = "ddl-imgCollapseExpandDDL-td-css-white";
     }
 }
 // default button makes postback(for enter key)
 protected void txtSearchItems_TextChanged(object sender, EventArgs e)
 {
     if (!UseJavaScriptForControlAction)
     {
         DataTable dtItems   = (DataTable)Session[("DDlCheckBoxListItemsSN" + ID)];
         string    RowFilter = String.Format(DataTextField + " LIKE '%" + UDFLib.EscapeLikeValue(txtSearchItems.Text) + "%'");
         dtItems.DefaultView.RowFilter = RowFilter;
         CheckBoxListItems.DataSource  = dtItems.DefaultView;
         CheckBoxListItems.DataBind();
         UpdatePanelheckBoxListItems.Update();
     }
 }