JoinEdge

class Program
    {
        static void Main(string[] args)
        {
            Vertex vert1 = new Vertex {X = 0,Y = 0};
            Vertex vert2 = new Vertex { X = 75, Y = 0 };
            Edge edge1 = new Edge {Source = vert1,Receiver = vert2};

            Vertex vert3 = new Vertex {X = 150, Y = 0};
            Vertex vert4 = new Vertex { X = 200, Y = 0 };
            Edge edge2 = new Edge { Source = vert3, Receiver = vert4 };

            Edge edge3 = new Edge { Source = vert2, Receiver = vert3 };

            List<Edge> edges = new List<Edge> {edge1, edge2, edge3};
        }
    }

    public class Vertex
    {
        public int X { get; set; }
        public int Y { get; set; }
    }

    public class Edge
    {
        public Vertex Source { get; set; }
        public Vertex Receiver { get; set; }
    }