if (openFileDialog1.ShowDialog() == DialogResult.Cancel)
                return;

            string filename = openFileDialog1.FileName;
            StreamReader R = new StreamReader(filename);
            myGraph = new Graph(R);
            input_nVertex = myGraph.nVerts;

            pictureBox1.Image = (Image)new Bitmap(pictureBox1.Width, pictureBox1.Height);
            Graphics g = Graphics.FromImage(pictureBox1.Image);
            Pen p = new Pen(Color.Black, 3);


            //float heightSeparation = pictureBox1.Height / myGraph.nVerts;
            //float widthSeparation = pictureBox1.Width / myGraph.nVerts;

            float circleSeparation = Convert.ToSingle(2 * Math.PI) / myGraph.nVerts;

            float centerX = pictureBox1.Width / 2;
            float centerY = pictureBox1.Height / 2;
            //g.TranslateTransform(centerX, centerY);

            for (int i = 1; i <= myGraph.nVerts; i++)
            {
                //PointF startPoint = new PointF(i * widthSeparation, i * heightSeparation);
                //PointF endPoint = new PointF(startPoint.X - 15, startPoint.Y - 15);
                //PointF centerPoint = new PointF(Convert.ToSingle(15 * Math.Cos((2 * Math.PI) / myGraph.nVerts) * i), Convert.ToSingle(15 * Math.Sin((2 * Math.PI) / myGraph.nVerts) * i));
                PointF centerPoint = new PointF(170 * Convert.ToSingle(Math.Cos(circleSeparation * i)) + centerX, 170 * Convert.ToSingle(Math.Sin   (circleSeparation * i)) + centerY);
                g.FillEllipse(Brushes.White, centerPoint.X - 25, centerPoint.Y - 25, 50, 50);
                g.DrawEllipse(p, centerPoint.X - 25, centerPoint.Y - 25, 50, 50);

                Point stringPoint = new Point(Convert.ToInt32(centerPoint.X - 13), Convert.ToInt32(centerPoint.Y - 13));
                g.DrawString(myGraph.vertexList[i - 1].label, new Font("Arial", 20), Brushes.Black, stringPoint);

                myGraph.vertexList[i - 1].centerPoint = centerPoint;
            }
            for (int i = 0; i < myGraph.nVerts; i++)
            {
                for (int j = 0; j < myGraph.nVerts; j++)
                {
                    if (myGraph.adjMatrix[i][j] != 0)
                    {
                        PointF startPosition = myGraph.vertexList[i].centerPoint;
                        PointF endPosition = myGraph.vertexList[j].centerPoint;
                        g.DrawLine(Pens.Black, startPosition, endPosition);

                        g.FillEllipse(Brushes.White, startPosition.X - 25, startPosition.Y - 25, 50, 50);
                        g.DrawEllipse(p, startPosition.X - 25, startPosition.Y - 25, 50, 50);
                        g.FillEllipse(Brushes.White, endPosition.X - 25, endPosition.Y - 25, 50, 50);
                        g.DrawEllipse(p, endPosition.X - 25, endPosition.Y - 25, 50, 50);

                        PointF stringPoint = new PointF(Convert.ToInt32(startPosition.X - 13), Convert.ToInt32(startPosition.Y - 13));
                        g.DrawString(myGraph.vertexList[i].label, new Font("Arial", 20), Brushes.Black, stringPoint);

                        stringPoint = new PointF(Convert.ToInt32(endPosition.X - 13), Convert.ToInt32(endPosition.Y - 13));
                        g.DrawString(myGraph.vertexList[j].label, new Font("Arial", 20), Brushes.Black, stringPoint);

                        stringPoint = new PointF((startPosition.X + endPosition.X) / 2, (startPosition.Y + endPosition.Y) / 2);
                        g.DrawString(myGraph.adjMatrix[i][j].ToString(), new Font("Arial", 20), Brushes.Black, stringPoint);
                    }
                }
            }