The assignment of a value type instance.

    int a;
    static void Main(string[] args)
        {
            Value v1 = new Value();
            v1.a = 10;

            Value v2 = v1;  // this statement copies value from v1 to v2.

            Console.WriteLine(v1.a);  // here the value is 10
            Console.WriteLine(v2.a);  // here the value is 10

            v1.a = 20;  // here the v1.a value is changed.

            Console.WriteLine(v1.a);  // here the value is 20
            Console.WriteLine(v2.a);  // here the value is 10
        }