public Task<string[]> GetPeopleNames()
{
    // GetPeople returns Task<Person[]>
    return database.GetPeople()
                   .Then()
                   .Select(x => x.FirstName + " " + x.LastName)
                   .Then()
                   .ToArray();
}

ILazy<string> lazy = new OneTryLazy<string>(() => {
    // If the following throws an exception it will throw an exception on
    // all subsequent calls to lazy.value
    var result = database.GetPeople();
    return result.Length == 1 ? "1 Person" : (result.Length + " People");
};

ILazy<string> lazy = new RetryLazy<string>(() => {
    // If the following throws an exception it will retry on
    // all subsequent calls to lazy.value
    var result = database.GetPeople();
    return result.Length == 1 ? "1 Person" : (result.ToString() + " People");
};