public edge <T> getEdgeByName(string edge)
        {
            vertex <T> source      = (vertex <T>)_vertex.Where(e => e.Name == edge[0].ToString()).ToList().ElementAt(0);
            vertex <T> Destiantion = (vertex <T>)_vertex.Where(e => e.Name == edge[1].ToString()).ToList().ElementAt(0);

            return(source.getEdge(Destiantion));
        }
        static void Main(string[] args)
        {
            /*
             * Graph<string> g1 = new Graph<string>("a,b,c,d,e,f,g", "ab,cd,ef,aa,eg", "1,2,3,4,5,6,7", "a");
             * Console.WriteLine(g1.getEdgeByName("ef").weight);
             *
             * vertex<double> a = new vertex<double>("a");
             * vertex<double> b = new vertex<double>("b");
             * vertex<double> c = new vertex<double>("c");
             * vertex<double> d = new vertex<double>("d");
             * vertex<double> e = new vertex<double>("e");
             * a.addEdge(b);
             * a.addEdge(c);
             * b.addEdge(c);
             * b.addEdge(d);
             * d.addEdge(c);
             * d.addEdge(e);
             * e.addEdge(c);
             * Graph<double> graph1 = new Graph<double>(new List<vertex<double>> { a, b, c, d, e });
             * vertex<double> f = new vertex<double>("f");
             * graph1.addVertix(f);
             * graph1.addEdge(e, f);
             * Console.WriteLine(graph1.getVertex(a).Name);
             * graph1.move(e);
             * Console.WriteLine(graph1.currentVertex.Name);
             * graph1.removeEdge(c, d);
             * Console.Read();
             */

            vertex <double> a = new vertex <double>("a");
            vertex <double> b = new vertex <double>("b");

            a.addEdge(b);
            Console.WriteLine(a.getEdge(b).weight.ToString());


            edge <double> DtoS = new edge <double>(a, b);

            Console.WriteLine(DtoS.destinationVertex.Name);
            Console.WriteLine(DtoS.sourceVertex.Name);
            Console.WriteLine(DtoS.weight.ToString());


            Console.Read();
        }