for (int num_i = 0; num_i < 9; num_i++)
                        {
                            switch (num_i % 3)
                            {
                                case 0:
                                    new_v.number = num_i;
                                    new_v.color = ConsoleColor.Black;
                                    new_v.x_coord = num_i * 10;
                                    new_v.y_coord = 0;
                                    break;
                                case 1:
                                    new_v.number = num_i;
                                    new_v.color = ConsoleColor.Black;
                                    new_v.x_coord = 100 - (num_i * 10);
                                    new_v.y_coord = 30;
                                    break;
                                case 2:
                                    new_v.number = num_i;
                                    new_v.color = ConsoleColor.Black;
                                    new_v.x_coord = (num_i * 10) - 20;
                                    new_v.y_coord = 60;
                                    break;
                            }
                            netw.arr_vertexes[num_i] = new_v;
                        }
                        
                            // edges are concatenated the vertexes by diagonal
                            // (ветви соединяют соответствующие узлы по диагонали: (0->1), (1->2), (2->3),... (9->10))
                            s_network.SimpleEdge new_ed = new s_network.SimpleEdge();
                            for (int num_i = 0; num_i < 10; num_i++)
                            {
                                if (num_i == 0 || num_i == 1 || num_i == 2 || num_i == 3 || num_i == 4 || num_i == 5 || num_i == 6 || num_i == 7)
                                {
                                    new_ed.begin_SimpleVertex = netw.arr_vertexes[num_i];
                                    new_ed.end_SimpleVertex = netw.arr_vertexes[num_i + 1];
                                    new_ed.color = ConsoleColor.Cyan;
                                    netw.arr_edges.Add(new_ed);
                                }
                                else
                                {
                                    switch (num_i)
                                    {
                                        case 8:
                                            new_ed.begin_SimpleVertex = netw.arr_vertexes[num_i];
                                            new_ed.end_SimpleVertex = netw.arr_vertexes[num_i - 5];
                                            new_ed.color = ConsoleColor.Cyan;
                                            netw.arr_edges.Add(new_ed);
                                            break;
                                        case 9:
                                            new_ed.begin_SimpleVertex = netw.arr_vertexes[num_i - 3];
                                            new_ed.end_SimpleVertex = netw.arr_vertexes[num_i - 5];
                                            new_ed.color = ConsoleColor.Cyan;
                                            netw.arr_edges.Add(new_ed);
                                            break;
                                    }
                                }
                        }
                        
                        // output data
                        string str3 = "Vertex'es data:";
                        Console.WriteLine(str3);
                        for (int num_i = 0; num_i < 9; num_i++)
                        { // output all vertex data
                            str3 = "number = " + netw.arr_vertexes[num_i].number.ToString() +
                              ", Color = " + netw.arr_vertexes[num_i].color.ToString() +
                              ", x = " + netw.arr_vertexes[num_i].x_coord.ToString() +
                              ", y = " + netw.arr_vertexes[num_i].y_coord.ToString();
                            Console.WriteLine(str3);
                        }
                        str3 = "Edge's data:";
                        Console.WriteLine(str3);
                        for (int num_i = 0; num_i < 10; num_i++)
                        { // output all edges data
                          str3 = "index " + num_i.ToString() + ": begin_Vertex = {number = " +
                            netw.arr_edges[num_i].begin_SimpleVertex.number.ToString() +
                            ", color = " + netw.arr_edges[num_i].begin_SimpleVertex.color.ToString() +
                            "},\n         end_Vertex = {number = " + netw.arr_edges[num_i].end_SimpleVertex.number.ToString() +
                            ", color = " + netw.arr_edges[num_i].end_SimpleVertex.color.ToString() +
                            "}, edge's color = " + netw.arr_edges[num_i].color.ToString();
                          Console.WriteLine(str3);
                        }
                        for (int num_i = 0; num_i < 10; num_i++)
                        {
                            if ()
                            {
                                new_ed.color = ConsoleColor.Green;
                                netw.arr_edges.Add(new_ed);
                            }
    
                        }
                         str3 = "\nEdge's data new:";
                        Console.WriteLine(str3);
                        for (int num_i = 0; num_i < 10; num_i++)
                        { // output all edges data
                          str3 = "index " + num_i.ToString() + ": begin_Vertex = {number = " +
                            netw.arr_edges[num_i].begin_SimpleVertex.number.ToString() +
                            ", color = " + netw.arr_edges[num_i].begin_SimpleVertex.color.ToString() +
                            "},\n         end_Vertex = {number = " + netw.arr_edges[num_i].end_SimpleVertex.number.ToString() +
                            ", color = " + netw.arr_edges[num_i].end_SimpleVertex.color.ToString() +
                            "}, edge's color = " + netw.arr_edges[num_i].color.ToString();
                          Console.WriteLine(str3);
                        }