Make a separate partial view file containing your menu code and than include it on each page you need it to use the menu.
In PHP:
<?php require_once(__ROOT__.'/mainMenu.php'); ?>
In ASP something like:
<%@ Register src="~/mainMenu/mainMenu.ascx" tagname="MainMenu" tagprefix="uc" %>
<uc:MainMenu ID="MainMenu" runat="server />
Ideally you can expand this logic and create a master template page and than feed just the dynamic content in it - that keeps all your code on one place and makes changes very simple.