Do I need a Global.asax.cs file at all if I’m using an OWIN Startup.cs class and move all configuration there?

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Startup.Configuration gets called slightly later than Application_Start, but I don’t think the difference will matter much in most cases.

I believe the major reasons we kept the other code in Global.asax are:

  1. Consistency with previous versions of MVC. (That’s where everybody currently expects to find this code.)
  2. Ability to add other event handlers. In Global.asax, you can handle other methods like Session_Start and Application_Error.
  3. Correctness in a variety of authentication scenarios. The Startup.Configuration method is only called if you have Microsoft.Owin.Host.SystemWeb.dll in your bin directory. If you remove this DLL, it will silently stop calling Startup.Configuration, which could be hard to understand.

I think the third reason is the most important one we didn’t take this approach by default, since some scenarios don’t include having this DLL, and it’s nice to be able to change authentication approaches without invalidating the location where unrelated code (like route registration) is placed.

But if none of those reasons apply in your scenario, I think you’d be fine using this approach.

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