private void btStatePattern_Click(object sender, EventArgs e)
{
string str = "";
StatePattern.Context context = new StatePattern.Context();
StartState startState = new StartState();
str += startState.doAction(context) + "\r\n";
str += context.getState().ToString() + "\r\n";
StopState stopState = new StopState();
str += stopState.doAction(context) + "\r\n";
str += context.getState().ToString() + "\r\n";
tbOutWindow.Text = str;
}