public class BinaryTreeNode{ public BinaryTreeNode Left { get; set; } public BinaryTreeNode Right { get; set; } public int Data { get; set; } public BinaryTreeNode(int data) {  this.Data = data; }}public void InsertIntoBST(BinaryTreeNode root, int data){  BinaryTreeNode _newNode = new BinaryTreeNode(data);  BinaryTreeNode _current = root;  BinaryTreeNode _previous = _current;  while (_current != null)  {   if (data < _current.Data)   {    _previous = _current;    _current = _current.Left;   }   else if (data > _current.Data)   {    _previous = _current;    _current = _current.Right;   }  }  if (data < _previous.Data)   _previous.Left = _newNode;  else   _previous.Right = _newNode;}