public int Delete()
{
var db = ObjectProvider.MakeDbInstance();
Console.Write("Enter email's id: ");
int id = int.Parse(Console.ReadLine());
db.Remove(db.Emails.FirstOrDefault(x => x.Id == id));
db.SaveChanges();
return(id);
}
public int Add()
{
var db = ObjectProvider.MakeDbInstance();
Email anEmail = ObjectProvider.MakeEmailInstance();
Console.Write("Enter email address: ");
anEmail.ContactTitle = Console.ReadLine();
Console.Write("Enter the id of belonging phonebook: ");
anEmail.PhonebookId = int.Parse(Console.ReadLine());
db.Add(anEmail);
db.SaveChanges();
return(anEmail.Id);
}