private void MainForm_Load(object sender, EventArgs e)
 {
     timer.Start();
     labelCurrentTime.Text = DateTime.Now.ToLongTimeString();
     CoatACount.Hide();
     CoatBCount1.Hide();
 }
 private void buttonCoatD_Click(object sender, EventArgs e)
 {
     CoatD1.Show();
     CoatCCount1.Hide();
     CoatACount.Hide();
     CoatBCount1.Hide();
 }