public static void Main()
Console.WriteLine("Mutable.X после вызова IncrementX(): {0}", a.Mutable.X);
public Mutable(int x, int y)
public void IncrementX() { X++; }
public int X { get; private set; }
public int Y { get; set; }
public Mutable Mutable = new Mutable(x: 5, y: 5);