static void Main(string[] args)
{
BinaryTree binaryTree = new BinaryTree();
binaryTree.Insert(12);
binaryTree.Insert(3);
binaryTree.Insert(15);
binaryTree.Insert(6);
binaryTree.Insert(9);
binaryTree.Insert(21);
binaryTree.Display();
Console.WriteLine("\nBinary Tree Count = {0}", binaryTree.Count());
Console.ReadLine();
}
