public void Add(string name, string dignity, int salary)
{
var soldier = new SoldierViewModel();
soldier.Dignity = dignity;
soldier.Name = name;
soldier.Salary = salary;
soldier.PropertyChanged += Soldier_OnNotifyPropertyChanged;
soldier.DeleteHandler += Soldier_OnDelete;
Soldiers.Add(soldier);
SelectedIndex = Soldiers.IndexOf(soldier);
army.Add(soldier);
}
