I have an ASP.NET Web Api solution which doesn't contain a Startup.cs class. I presume this is because the solution wasn't created as an MVC solution.

All the code for the startup is defined in the Global.asax.cs file as you can see below

public class Global : HttpApplication
{
    void Application_Start(object sender, EventArgs e)
    {
        // Code that runs on application startup
        AreaRegistration.RegisterAllAreas();
        GlobalConfiguration.Configure(WebApiConfig.Register);
        RouteConfig.RegisterRoutes(RouteTable.Routes);
    }
}

However, now I want to have support for OAuth and all the documentation that I've found is based on a Startup.cs with the following class

public partial class Startup
{
    public void Configuration(IAppBuilder app)
    {
        ConfigureAuth(app);
    }
}

Is it possible to just add this new class in my solution and the solution will continue working?

Will this have any conflicts with the Global.asax.cs class?

EDIT: After I added the Startup.cs class, I can't hit the break point I added into it...

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Microsoft.Owin;
using Owin;

[assembly: OwinStartup(typeof(MyGame.Startup))]

namespace MyGame
{
    public partial class Startup
    {
        public void Configuration(IAppBuilder app)
        {
            ConfigureAuth(app);
        }
    }
}

Any idea what's going on?