AjaxControlToolkit.ListSearchExtender.OnLoad C# (CSharp) Метод

        protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);

            // If this textbox has default focus, use ClientState to let it know
            ClientState = (String.Compare(Page.Form.DefaultFocus, TargetControlID, StringComparison.OrdinalIgnoreCase) == 0) ? "Focused" : null;
        }