form class

public partial class Form1 : Form
    {
        Newton newton;
        GradientReduction grad;
        LeastSquares sqr;
        CoordinateDescent desc;
        public Form1()
        {
            InitializeComponent();
            newton = new Newton();
            grad = new GradientReduction();
            sqr = new LeastSquares();
            desc = new CoordinateDescent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            while (graphView.Series.Count > 0)
            {
                graphView.Series.RemoveAt(0);
            }
            tableView.Text = newton.print();
        }

        private void tableButton_CheckedChanged(object sender, EventArgs e)
        {
            if (tableButton.Checked)
            {
                graphView.Visible = false;
                tableView.Visible = true;
            }
        }

        private void graphButton_CheckedChanged(object sender, EventArgs e)
        {
            if (graphButton.Checked)
            {
                graphView.Visible = true;
                tableView.Visible = false;
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            while (graphView.Series.Count > 0)
            {
                graphView.Series.RemoveAt(0);
            }
            List<LinkedList<double>> Xi = grad.solve();
            graphView.Series.Add("X1");
            graphView.Series.Add("X2");
            graphView.Series.Add("X3");
            for (int i = 0; i < Xi.Count; i++)
            {
                graphView.Series[i].ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.Line;
                double[] X = new double[Xi[i].Count];
                Xi[i].CopyTo(X, 0);
                for (int j = 0; j < X.Length; j++)
                    graphView.Series[i].Points.AddXY(j + 1, X[j]);
            }
            tableView.Text = grad.print();
        }

        private void button4_Click(object sender, EventArgs e)
        {
            sqr.solve();
            double[] X = sqr.getX();
            double[] Y = sqr.getY();
            double[] Yapp = sqr.getAppY();

            while (graphView.Series.Count > 0)
            {
                graphView.Series.RemoveAt(0);
            }
            graphView.Series.Add("Y appr.");
            graphView.Series[0].ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.Line;
            graphView.Series.Add("Y precise");
            graphView.Series[1].ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.Line;
            for (int i = 0; i < X.Length; i++)
            {
                graphView.Series[0].Points.AddXY(X[i], Yapp[i]);
            }
            for (int i = 0; i < X.Length; i++)
            {
                graphView.Series[1].Points.AddXY(X[i], Y[i]);
            }
            tableView.Text = sqr.print();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            desc.solve();
            while (graphView.Series.Count > 0)
            {
                graphView.Series.RemoveAt(0);
            }
            List<List<double>> Xi = desc.getXi();
            graphView.Series.Add("X1");
            graphView.Series.Add("X2");
            graphView.Series.Add("X3");
            for (int i = 0; i <3; i++)
            {
                graphView.Series[i].ChartType = System.Windows.Forms.DataVisualization.Charting.SeriesChartType.Line;
                for (int j = 0; j < Xi.Count; j++)
                    graphView.Series[i].Points.AddXY(j + 1, Xi[j][i]);
            }
            tableView.Text = desc.print();
        }
    }