public static TControl FindControlRecursive<TControl>(this Control rootControl, string controlID) where TControl : Control {
            var result = rootControl as TControl;
            if(result != null && String.Equals(rootControl.ID, controlID, StringComparison.OrdinalIgnoreCase)) {
                return result;
            }
            foreach(Control controlToSearch in rootControl.Controls) {
                var controlToReturn = FindControlRecursive<TControl>(controlToSearch, controlID);
                if(controlToReturn != null) {
                    return controlToReturn;
                }
            }
            return null;
        }
        public static Control FindControlRecursive(this Control rootControl, string controlID) {
            if(String.Equals(rootControl.ID, controlID, StringComparison.OrdinalIgnoreCase)) {
                return rootControl;
            }
            foreach(Control controlToSearch in rootControl.Controls) {
                Control controlToReturn = FindControlRecursive(controlToSearch, controlID);
                if(controlToReturn != null) {
                    return controlToReturn;
                }
            }
            return null;
        }
        public static TControl FindParentRecursive<TControl>(this Control rootControl) where TControl : Control {
            if(rootControl.Parent is TControl) {
                return (TControl)rootControl.Parent;
            }
            return rootControl.Parent != null ? rootControl.Parent.FindParentRecursive<TControl>() : null;
        }

        protected void MenuListRepeater_ItemDataBound(object sender, RepeaterItemEventArgs e) {
            LinkButton linkButton = e.Item.FindControlRecursive<LinkButton>("MenuItemLinkButton");
            HiddenField hdnField = e.Item.FindControlRecursive<HiddenField>("hdnValue");
        }

        protected void MenuItemLinkButton_Click(object sender, EventArgs e) {
            LinkButton linkButton = (LinkButton)sender;
            RepeaterItem repeaterItem = linkButton.FindParentRecursive<RepeaterItem>();
            HiddenField hdnField = repeaterItem.FindControlRecursive<HiddenField>("hdnValue");
        }