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I was asking a related question but messed the title up and no-one would understand it. Since I am able now to ask the question more precisely, I decided to reformulate it in a new question and close the old one. Sorry for that. So what I want to do is passing data (my custom user's nickname as stored in the db) to the LoginUserControl. This login gets rendered from the master page via Html.RenderPartial(), so what I really need to do is making sure that, say ViewData["UserNickname"] is present on every call. But I don't want to populate ViewData["UserNickname"] in each and every action of every controller, so I decided to use this approach and create an abstract base controller which will do the work for me, like so: public abstract class ApplicationController : Controller { private IUserRepository _repUser; public ApplicationController() { _repUser = RepositoryFactory.getUserRepository(); var loggedInUser = _repUser.FindById(User.Identity.Name); //Problem! ViewData["LoggedInUser"] = loggedInUser; } } This way, whatever my deriving Controller does, the user information will already be present. So far, so good. Now for the problem: I can't call User.Identity.Name because User is already null. This is not the case in all of my deriving controllers, so this is specific for the abstract base controller. I am setting the User.Identity.Name via FormsAuthentication at another place in the code, but I think this can't be the problem - afaik User.Identity.Name can be null, but not User itself. It looks to me like the HttpContext is not available (since also null ;-) and that I am missing a simple yet important point here. Can anyone give me some hints? I would really appreciate it.

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