public async Task<IHttpActionResult> GetUsersAsync(string roleId)
{
var operation = new TableDal(ConfigurationManager.AppSettings["storageConnection"], TableNames.UserAdminRoleAssignments);
var result = (IEnumerable<UserAdminRoleAssignmentEntity>)(operation.RetrieveUsersByRoleId(roleId));
return CreateSuccessResult(result);
}