private void quit_button_Click(object sender, EventArgs e)
        {
            DialogResult dialogResult = MessageBox.Show("Do you want to exit?", "Warning", MessageBoxButtons.YesNo);

            if (dialogResult == DialogResult.Yes)
            {
                SavingAndReading save = new SavingAndReading();
                save.WriteSystemList();

                this.Close();
            }
        }
        private void AddSubjects_FormClosing(object sender, FormClosingEventArgs e)
        {
            DialogResult dialogResult = MessageBox.Show("Do you want to exit?", "Warning", MessageBoxButtons.YesNo);

            if (dialogResult == DialogResult.Yes)
            {
                SavingAndReading save = new SavingAndReading();
                save.WriteSystemList();
            }
            else
            {
                e.Cancel = true;
            }
        }
        public void WebpageAnalyzationMain(string filename)
        {
            SavingAndReading data = new SavingAndReading();

            string             url = System.IO.File.ReadAllText(filename);
            WebpageAnalyzation web = new WebpageAnalyzation();

            HtmlDocument doc = web.DepartmentNodeCollection(url);

            web.timePX(doc);
            web.Subject(doc);
            web.CountSubjectInEachDay(doc);
            web.CompeletTT(doc);
            web.print();

            data.WriteSystemList();
        }
        //private void read_button_Click(object sender, EventArgs e)
        //{

        //}

        private void save_button_Click(object sender, EventArgs e)
        {
            SavingAndReading data = new SavingAndReading();

            data.WriteSystemList();
        }