public override void CreateRole(string roleName)
        {
            SecUtility.CheckParameter(ref roleName, true, true, true, 255, "roleName");
            var context = new MyLifeEntities();
            var obj = new tblRoles {Name = roleName};
            context.AddTotblRoles(obj);

            try
            {
                context.SaveChanges();
            }
            catch (DbException)
            {
                throw new ProviderException(string.Format("The role '{0}' already exists.", roleName));
            }
        }