Below is a screen-shot of the simple application we have been building:

Here is the ProductsControllers that implements the /Products URL and retrieves the categories from a database and passes them to a view template to render:

Here is the Index.cshtml view that we are using the render the /Products response:

Here is the SiteLayout.cshtml layout file we are using to implement a consistent look and feel across our site:

Here is the _ViewStart.cshtml file that we are using to specify that all views in our site by default use the SiteLayout.cshtml file:

And here is the generated HTML from the /Products URL:

And because we now have a common layout file for our site, we can build out more functionality, controllers and views within our application - and have a site UI experience that is both consistent and very easy to maintain.