static void Main(string[] args)
{
MyClass M=new MyClass();
M.Age = 10;
M.Name = "unos";
MyClass A = new MyClass();
A.Age = 20;
A.Name = "reza";
M = A; // they point to the same place in memory
A = null; // A got null but M's reference to memory is alive. check M
M.Update(30,"meysam");
M.Update2(M);
Console.ReadLine();
}