//Define the Context Object.

//The Context class (object) initialises the State object and invokes methods on the State class (object).
public class Context
{
public IState State { get; set; }
public double Balance { get; set; }
private string _owner;

public Context(string owner)
{
_owner = owner;
State = new SilverState();
}

public void Deposit(double amount)
{
State.Deposit(this, amount);
Console.WriteLine("{0} deposited {1}", _owner, amount);
ShowBalance();
}

public void Withdraw(double amount)
{
if (State.Withdraw(this, amount))
{
Console.WriteLine("{0} withdrew {1}", _owner, amount);
}
else
{
Console.WriteLine("\t15% charge applied for {0}", _owner);
}

ShowBalance();
}

public void PayInterest()
{
if (State.PayInterest(this))
{
ConsoleConsole.WriteLine("Interest paid for {0}", _owner);

ShowBalance();
}
}

private void ShowBalance()
{
Console.WriteLine("\tBalance for {0}": {1}", _owner, Balance);
Console.WriteLine("\tStatus for {0}": {1}\n", _owner, State.GetType().Name);
}
}