public bool IsUserInRole(string tenantName, string username, string roleName)
        {
            if (string.IsNullOrEmpty(tenantName))
            {
                throw new ArgumentNullException("tenantName");
            }
            if (string.IsNullOrEmpty(username))
            {
                throw new ArgumentNullException("username");
            }
            if (string.IsNullOrEmpty(roleName))
            {
                throw new ArgumentNullException("roleName");
            }

            return(AuthorizationLogic.IsUserInRole(tenantName, username, roleName));
        }