public GSM(string model, string manufacturer) { this.Model = model; this.Manufacturer = manufacturer; this.Price = null; this.Owner = null; this.battery = null; this.display = null; this.callHistory = new List<Call>(); }
public GSM(string model, string manufacturer, decimal? price, string owner , Battery battery, Display display) { this.Model = model; this.Manufacturer = manufacturer; this.Price = price; this.Owner = owner; this.Battery = battery; this.Display = display; }