public MainViewModel()
 {
     people = new DoubledLinkedList <Person>();
     DownloadFromDateBaseF();
     //newPerson = new Person("Sidorov", new DateTime(1996, 01, 03), 179); this.AddPerson();
     //newPerson = new Person("Ivanov", new DateTime(1995, 03, 03), 170); this.AddPerson();
     //newPerson = new Person("Petrov", new DateTime(1996, 02, 03), 172); this.AddPerson();
     //newPerson = new Person("Sadovnichyi", new DateTime(1996, 12, 12), 178); this.AddPerson();
     newPerson = new Person("aaa", new DateTime(2001, 01, 01), 0);
 }