static void Main(string[] args)
{
var methods = new Menu();
methods.FirstMethod = "1";
methods.SecondMethod = "2";
methods.ThirdMethod = "3";
methods.Leave = "Leave";
methods.Choice();
var method1 = new Method1();
method1.One();
var method2 = new Method2();
method2.Two();
var method3 = new Method3();
method3.Three();
var leave = new Leave();
leave.Four();
}