Asp.Net MVC 4 Base Controller to expose AD User information

ADLookup.cs

public class AdLookup
{
    public static DomainContext GetUserDetails()
    {
        using (PrincipalContext pc = new PrincipalContext(ContextType.Domain))
        {
            IPrincipal principal = HttpContext.Current.User;
            WindowsIdentity identity = ((WindowsIdentity)principal.Identity);
            UserPrincipal user = UserPrincipal.FindByIdentity(pc, identity.Name);
         
            if (principal != null)
            {
                return new DomainContext()
                {
                    userGuid = user.Guid,
                    DisplayName = user.DisplayName,
                    GivenName = user.GivenName,
                    EmailAddress = user.EmailAddress,
                    Groups = user.GetGroups().OrderBy(p=>p.Name).Select(p=>p.Name).ToList()
                };
            }
        }
        return null;
    }
}

BaseController.cs

public class BaseController : Controller
{
    //Makes userContext avaiable in any controller inheriting from BaseController
    public DomainContext userContext { get; set; }

    protected override void OnActionExecuted(ActionExecutedContext filterContext)
    {
        base.OnActionExecuted(filterContext);
        userContext =  AdLookup.GetUserDetails();
        ViewData["BaseController_DomainContext"] = userContext;
    }
}

DomainContext.cs

public class DomainContext
{
    //Populate with any needed properties from Prinipal
    public Guid? userGuid { get; set; }
    public string DisplayName { get; set; }
    public string GivenName { get; set; }
    public string EmailAddress { get; set; }
    public List<string> Groups { get; set; }
}

Index.cshtml

@using MvcApplication2.Controllers
@{
ViewBag.Title = "Index";
DomainContext domainContext = (DomainContext)ViewData["BaseController_DomainContext"];

}

<h2>@domainContext.DisplayName</h2>
<hr/>
Welcome:      @domainContext.GivenName <br/>
eMail:        @domainContext.EmailAddress <br/>
Guid:         @domainContext.userGuid
<h2>Groups:</h2>
@foreach (string name in domainContext.Groups)
{
<li>@name</li>
}