How can I have a code block called across multiple master pages in .Net?

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Masterpage

ASP.NET4

Hello!

I have a site with 7 different master pages. But every master page has the same "logic" for the menu. Thus I need to have the same code block for the menu on all 7 master pages.

If I implement this by copying the same code block on all 7 master pages, I will need to edit the menu 7 times if there is any change needed in the menu.

To fix this I started using User Controls that I could define outside the master pages, and then call on all the master pages.

This is working great for me, but my development team lead keeps bringing up the issue of over burdening the system by using something like User Controls which is totally not made for this kind of usage, and thus untested for its long term implications.

Does anyone here have a better solution, or is it safe to assume that User Controls is the way forward?

To give you a sense of how I am implementing my master pages you can review my post here:
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Do let me know if I need to provide any more details.

Thanks a ton!