RealtimeAnalysis.FormPRM.buttonCheck_Click C# (CSharp) Method

        private void buttonCheck_Click(object sender, EventArgs e)
        {
            this.Cursor = Cursors.WaitCursor;

            List<Task> listTask = new List<Task>();

            Task taskEms = new Task(
                double.Parse(textBoxEmsPi.Text),
                double.Parse(textBoxEmsTheta.Text),
                double.Parse(textBoxEmsPi.Text),    // deadline = period
                0);
                  
            Task taskTms = new Task(
                double.Parse(textBoxTmsPi.Text),
                double.Parse(textBoxTmsTheta.Text),
                double.Parse(textBoxTmsPi.Text),    // deadline = period
                0);

            listTask.Add(taskEms);
            listTask.Add(taskTms);

            DataTable dtSync = dataGridViewSync.DataSource as DataTable;
            foreach (DataRow dr in dtSync.Rows)
            {
                Task t = new Task(
                    double.Parse(dr["Period"].ToString()), 
                    double.Parse(dr["ExecutionTime"].ToString()) + 2 * _overhead,
                    double.Parse(dr["ExecutionTime"].ToString()) + 2 * _overhead,   // deadline = execution
                    double.Parse(dr["Phase"].ToString()),
                    0);

                listTask.Add(t);                
            }

            double interval = listTask[0].Period;
            foreach (Task t in listTask)
            {
                interval = (double)GetLCM((long)interval, (long)t.Period);
            }
            
            FormChart chart = new FormChart("Resource demand / supply");
            chart.GetLable.Text = "Schedulable";

            try
            {
                Series seriesDBF = new Series("Resource Demand");
                seriesDBF.ChartArea = "ChartArea1";
                seriesDBF.ChartType = SeriesChartType.StepLine;
                seriesDBF.Legend = "Legend1";
                seriesDBF.Color = Color.Blue;

                Series seriesSBF = new Series("Resurce Supply");
                seriesSBF.ChartArea = "ChartArea1";
                seriesSBF.ChartType = SeriesChartType.Line;
                seriesSBF.Legend = "Legend1";
                seriesSBF.Color = Color.Red;

                DataTable dt = GetSelectedTaskSet();
                
                for (double t = 0; t <= interval; t += 1)
                {
                    double dbf = GetDBF_Sporadic_EDF(listTask, t);
                    if (dbf > t)
                        chart.GetLable.Text = "Not Schedulable";

                    seriesDBF.Points.Add(new DataPoint(t, dbf));
                    seriesSBF.Points.Add(new DataPoint(t, t));
                }

                chart.AxisX.Title = "Interval Length";
                chart.AxisY.Title = "Resource demand / supply";
                chart.AxisX.Minimum = 0;

                chart.AddSeries(seriesDBF);
                chart.AddSeries(seriesSBF);
            }
            finally
            {
                this.Cursor = Cursors.Default;
            }
            chart.Show();
        }