private IBinaryTreeNode <T> FindWithParent(T item, out IBinaryTreeNode <T> parent)
{
IBinaryTreeNode <T> current = _head;
parent = null;
while (current != null)
{
var res = current.CompareTo(item);
if (res > 0)
{
parent = current;
current = current.Left;
}
else if (res < 0)
{
parent = current;
current = current.Right;
}
else
{
break;
}
}
return(current);
}
