//
public string WriteEverything()
{
StringBuilder stroitel = new StringBuilder();
stroitel.Append("The model is: ").Append(this.model).Append("\n");
stroitel.Append("The manufacturer is: ").Append(this.manufacturer).Append("\n");
if (this.price != null)
{
stroitel.Append("The price is: ").Append(this.price).Append("\n");
}
if (this.owner != null)
{
stroitel.Append("The owner is: ").Append(this.owner).Append("\n");
}
if (this.BatteryInfo != null)
{
stroitel.Append(Battery.WriteEverythingBattery());
}
if (this.DisplayInfo != null)
{
stroitel.Append(Display.WriteEverythingDisplay());
}
return(stroitel.ToString());
}
