Domain.User.OnUserAddedToRoleEvent C# (CSharp) Method

        protected void OnUserAddedToRoleEvent(UserAddedToRoleEvent e)
        {
            if (_roles == null)
            {
                _roles = new List<string>();
            }
            if (!_roles.Contains(e.Role))
            {
                _roles.Add(e.Role);
            }
        }