static void Main(string[] args)
{
Value val1 = new Value(2);
Value val2 = new Value(7);
Value val3 = new Value(2);
Value val4 = new Value(8);
Write.Do(val1, val2);
Console.WriteLine("after do : {0}; {1} ", val1.i, val2.i);
Write.Do1(ref val3, val4);
Console.WriteLine("after do1 : {0}; {1} ", val3.i, val4.i);
Console.ReadLine();
}