/// <summary>
/// Loads the phone book from local disk.
/// </summary>
private static void LoadPhoneBook()
{
var json = File.ReadAllText(SettingsJsonPath);
PhoneBook = JsonConvert.DeserializeObject <PhoneBook>(json);
}
/// <summary>
/// Create an empty phone book and save object to local disk.
/// </summary>
private static void CreateNewPhoneBook()
{
PhoneBook = new PhoneBook();
SavePhoneBook();
}