How to Configure Areas in ASP.NET MVC3

Right click on your web project and select Add -> Area… Then type the name of the area and Visual Studio will take care of the rest which is to generate all the necessary classes. For example the area registration might look like this:

public class AreasDemoAreaRegistration : AreaRegistration
{
    public override string AreaName
    {
        get
        {
            return "AreasDemo";
        }
    }

    public override void RegisterArea(AreaRegistrationContext context)
    {
        context.MapRoute(
            "AreasDemo_default",
            "AreasDemo/{controller}/{action}/{id}",
            new { action = "Index", id = UrlParameter.Optional }
        );
    }
}

and in Application_Start of your Global.asax all you need is:

AreaRegistration.RegisterAllAreas();