public async Task <int> CreateAsync(EmployeeClassification classification)
        {
            if (classification == null)
            {
                throw new ArgumentNullException(nameof(classification), $"{nameof(classification)} is null.");
            }

            using (var db = new OrmCookbook())
            {
                return(await db.InsertWithInt32IdentityAsync(classification).ConfigureAwait(false));
            }
        }