Calculate binary-tree height

using System;

class Program
{
    class Node
    {
        public int Value { get; private set; }
        public Node Left { get; set; }
        public Node Right { get; set; }
        public Node(int value) { Value = value; }
    }

    static int Height(Node node)
    {
        if (node == null) return 0;
        return 1 + Math.Max(Height(node.Left), Height(node.Right));
    }

    static void Main()
    {
        Node root = new Node(8);
        root.Left = new Node(4);
        root.Right = new Node(12);
        root.Left.Left = new Node(2);
        Console.WriteLine(Height(root));
    }
}