public BNode(int e)
 {
     data  = e;
     left  = null;
     right = null;
 }
 public void Add(int e)
 {
     root = Add(root, e);
 }
 public BNode()
 {
     data  = 0;
     left  = null;
     right = null;
 }
 public void Initailize()
 {
     this.root = null;
 }