ASP。Net MVC存储CustomIdentity的最佳实践

I'm using ASP.NET MVC 3 with Entity Framework 4. When a user logs in, i would like to store some informations from the database like ID, Name etc. So i created my own CustomIdentity/CustomPrincipial but i dont want to cast every time, so i create a BaseController who cast the Identity:I'm using ASP.NET MVC 3 with Entity Framework 4