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