[Code dump, not a question] Event handeling program in c#

{
    public delegate void Mydel(int a);
    class Program
    {
        //this is ok
        public static event Mydel _MyEvt;
        static void Main(string[] args)
        {

          //Can i define event in this part give some error
            public static event Mydel _MyEvt;
            opreation g = new opreation();

            _MyEvt += new Mydel(g.Hello);
            //_MyEvt += new Mydel(Greet.Hi);
            //_MyEvt += new Mydel(Greet.Bye);
            start();
            Console.ReadKey();
        }
        public static void start()
        {
               //i emplement uing abstract method but i want as normal method
            //can i pass parameter to event as normal
            int a;
            Console.WriteLine("Enter Parameter=");
            a = Convert.ToInt32(Console.ReadLine());
            _MyEvt(a);

        }
    }
}