public static void Copy(TreeNode <T> srcTree, TreeNode <T> destTree)
{
if (srcTree.Left != null)
{
destTree.AddLeft(srcTree.Left.Value);
Copy(srcTree.Left, destTree.Left);
}
if (srcTree.Right != null)
{
destTree.AddRight(srcTree.Right.Value);
Copy(srcTree.Right, destTree.Right);
}
}