public void CreateLevelLinkedList()
{
// create a new tree sructure
TreeNode <int> root = new TreeNode <int>(3);
TreesAndGraphs.Insert(root, 2);
TreesAndGraphs.Insert(root, 1);
TreesAndGraphs.Insert(root, 3);
TreesAndGraphs.Insert(root, 5);
TreesAndGraphs.Insert(root, 4);
TreesAndGraphs.Insert(root, 6);
List <LinkedList <TreeNode <int> > > list = new List <LinkedList <TreeNode <int> > >();
TreesAndGraphs.CreateLevelLinkedList(root, list, 0);
// View the content of the list to see the linkedlist structure
}