public interface IBankAccount // Can only add public Modifier , Or nothing
void Playin(decimal money); // Function without any embellishment
bool WithDrew(decimal money);
decimal Account

class aa:IBankAccount
private decimal banance;

public void Playin(decimal money)// We have to add only public Modifier

public bool WithDrew(decimal money)
if (banance >= money)
banance -= money;
return true;
else return false;
public decimal Account
return banance;
public override string ToString()// Within the system tostring Is a virtual base class , Can be rewritten
return String.Format("{0,6:c}",banance);

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