我在数据保存和计时器方面遇到了一些问题

Question

我的项目是风力赛车系统，其中有2所学校竞争自己的自制风力螺旋桨，该螺旋桨连接到给定的玩具车套件上。应用程序启动时，风扇和计时器将打开。

这些是我的数据保存部分代码；

`string q = "SELECT * from Placing";
        cmd.CommandText = q;
        con.Open();

        try
        {
            SaveFileDialog sfd = new SaveFileDialog();
            sfd.Filter = "*.csv ( comma separated value) |*.csv"; //save in what format
            sfd.OverwritePrompt = false;
            if (sfd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                btnLaunch.Enabled = false;
                btnStart.Enabled = true;
                path = sfd.FileName; //path is where you save the file at
            }
            btnLaunch.Enabled = false;
            btnStart.Enabled = true;
        }
        catch (Exception etc)
        {
            MessageBox.Show("An error occured: " + etc.Message);
        }`

[Excel]`using (StreamWriter sw = new StreamWriter(MyProperty, true))

        {
            //write into excel file
            sw.WriteLine("RACE" + " " + racenumber1++ + "," + (cmbSch1.SelectedIndex + 1) + "," + cmbSch1.Text + "," + st1 + " " + "seconds" + "," + DateTime.Now);
            sw.WriteLine("RACE" + " " + racenumber2++ + "," + (cmbSch2.SelectedIndex + 1) + "," + cmbSch2.Text + "," + st2 + " " + "seconds" + "," + DateTime.Now);
            sw.Dispose();
        }`

[Timer]`TimeSpan elapsed = sw1.Elapsed;
        lblTimer1.Text = String.Format("{2:00}.{3:00}",
        Math.Floor(elapsed.TotalHours), elapsed.Minutes,
        elapsed.Seconds, elapsed.Milliseconds / 10);
        st1 = lblTimer1.Text;`

Screenshot of the application screen