public Node Add(int data)
{
if (this.data > data)
{
if (left != null)
{
return(left.Add(data));
}
left = new Node(data, this);
return(left);
}
else
{
if (right != null)
{
return(right.Add(data));
}
right = new Node(data, this);
return(right);
}
}