I have MVC 4 web app deployed on 'Alpha' domain and web app is getting the Windows User details using the following code. We have trusted relationship between 3 different domains (Alpha, Beta and Gamma). When a user called `Beta\bloggs` login opens the web app following code returns the details of `alpha\bloggs`. Is there a way to get the right user from active directory. 

Thanks in advance.

```
using (PrincipalContext context = new PrincipalContext(ContextType.Domain))
{
    using (UserPrincipal user = UserPrincipal.FindByIdentity(context, username))
    {
        if (user != null)
        {
            HttpContext.Current.Session["FullUserName"] = fullName;
            HttpContext.Current.Session["EmailAddress"] = user.EmailAddress;
        }
    }
}

```