/// <summary>
/// Updates the user.
/// </summary>
/// <param name="user">The user.</param>
public void UpdateUser(User user)
{
if (user == null)
{
throw new ArgumentNullException("user");
}
bool duplicate = _manager.IsDuplicate(user.SteamUserId, user.FacebookUserId);
if (duplicate)
{
throw new DuplicateSteamUserException();
}
_manager.UpdateUser(Map(user));
}