using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Output: {0}", TestStruct.Value1);

    }

}

​

​

    public struct TestStruct

    {

        public static readonly TestStruct Value1 = 1;

        public static readonly TestStruct Value2 = 2;

        public static readonly TestStruct Value3 = 3;

​

​

        private int _value;

​

        private TestStruct(int value)

        {

            _value = value;

        }

​

        public static implicit operator int(TestStruct instance)

        {

            return instance._value;

        }

​

        public static implicit operator TestStruct(int instance)

        {

            return new TestStruct(instance);

        }

    }

​