private void Show_satistics_CheckedChanged(object sender, EventArgs e)
         {
            
                 if (Show_satistics.Checked)
                 {
                     if (statform == null || statform.IsDisposed)
                     {
                         statform = new StatisticForm();
                         statform.Show();
                         statform.CreateGraph();
                     }
                     else
                     {
                         statform.Show();
                         statform.CreateGraph();
                     }
                    
                }
             
                             
         }