public async Task <AzureTableUser> FindByNameAsync(string userName)
        {
            AzureTableUser User   = null;
            TableResult    Result = await UserTable.ExecuteAsync(TableOperation.Retrieve <UserDataEntity>("UserData", userName));

            UserDataEntity Entity = (UserDataEntity)Result.Result;

            if (Entity != null)
            {
                User = Entity.ToUser();
            }
            return(User);
        }