public void AddEdge(string name1, string name2, int length)
{
if (list.Contains(name1) && list.Contains(name2))
{
Vertex first = list.GetVertex(name1);
Vertex second = list.GetVertex(name2);
if (list[first, second] == null)
{
Edge edge = new Edge(second, length);
list.AddLink(first, edge);
}
}
else
{
throw new VertexDoesNotExistException();
}
}
