C#] if, switch

using System;
using System.Text;

namespace MyPractice
{
    class Program
    {
        static void Main(string[] args)
        {
            /*
             * C# - if, switch 
             * 2019.04.05
             * by 4ru4ka   
             */

            if (args.Length != 1)
            {
                Console.WriteLine("program /option");
                return;
            }
            bool switch1 = false;
            bool switch2 = false;

            string cw = "This is default";
            string opt = args[0];

            switch (opt.ToLower())
            {
                case "/sw1":
                    switch1 = true;
                    break;
                case "/sw2":
                case "/switch2": //case: case:
                    switch2 = true;
                    break;
                default:
                    Console.WriteLine(cw);
                    break;
            }


        }
    }
}