AjaxControlToolkit.DropDownExtender.OnPreRender C# (CSharp) Метод

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

            // If the dynamic populate functionality is being used but
            // no target is specified, used the drop down control
            if((!String.IsNullOrEmpty(DynamicContextKey)
                || !String.IsNullOrEmpty(DynamicServicePath)
                || !String.IsNullOrEmpty(DynamicServiceMethod))
                && String.IsNullOrEmpty(DynamicControlID))
                DynamicControlID = DropDownControlID;

            ResolveControlIDs(_onShow);
            ResolveControlIDs(_onHide);
        }