This is the second in a series of videos about the graph data structure. It shows how a graph can be implemented in code with VB.NET. This object oriented approach involves writing a vertex class and a graph class. The graph class includes methods to add new vertices, new edges and to display the contents of a vertex. In this particular implementation, a two dimensional array is employed as an adjacency matrix. The graph class also includes a method to and return the adjacency matrix array.