public void Inorder() // Instance calls the methods within the node class above
 {
     if (root != null)
     {
         root.Inorder();
     }
 }
 public void Inorder()
 {
     if (left != null)
     {
         left.Inorder();
     }
     WriteLine(data);
     if (right != null)
     {
         right.Inorder();
     }
 }