Where and how is the _ViewStart.cshtml layout file linked?

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From ScottGu’s blog:

Starting with the ASP.NET MVC 3 Beta release, you can now add a file
called _ViewStart.cshtml (or _ViewStart.vbhtml for VB) underneath the
\Views folder of your project:

The _ViewStart file can be used to define common view code that you
want to execute at the start of each View’s rendering. For example,
we could write code within our _ViewStart.cshtml file to
programmatically set the Layout property for each View to be the
SiteLayout.cshtml file by default:

Because this code executes at the start of each View, we no longer
need to explicitly set the Layout in any of our individual view files
(except if we wanted to override the default value above).

Important: Because the _ViewStart.cshtml allows us to write code, we
can optionally make our Layout selection logic richer than just a
basic property set. For example: we could vary the Layout template
that we use depending on what type of device is accessing the site –
and have a phone or tablet optimized layout for those devices, and a
desktop optimized layout for PCs/Laptops. Or if we were building a
CMS system or common shared app that is used across multiple customers
we could select different layouts to use depending on the customer (or
their role) when accessing the site.

This enables a lot of UI flexibility. It also allows you to more
easily write view logic once, and avoid repeating it in multiple
places.

Also see this.

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