csharp da Kronometre yapmak in by syberlord

namespace Kronometre
{
publicpartialclassForm1 : Form
{
publicint KalanSure;
public Form1()
{
InitializeComponent();
}
private**** Kronometrem_Click(object sender, EventArgs e)
{
}
private**** cmbHiz_SelectedIndexChanged(object sender, EventArgs e)
{
}
private**** btnBasla_Click(object sender, EventArgs e)
{
KalanSure = System.Convert.ToInt32(txtSure.Text);
lblsure.Text = System.Convert.ToString(KalanSure);
lstKayit.Items.Add("Kronometre başladı" + DateTime.Now.TimeOfDay.ToString());
tmrKronometre.Interval = System.Convert.ToInt32(cmbHiz.Text);
tmrKronometre.Start();
}
private**** btnDur_Click(object sender, EventArgs e)
{
tmrKronometre.Stop();
lstKayit.Items.Add("Kronometre Durduruldu" + DateTime.Now.TimeOfDay.ToString());
}
private**** tmrKronometre_Tick(object sender, EventArgs e)
{
KalanSure = KalanSure -1;
lblsure.Text=System.Convert.ToString(KalanSure);
if(KalanSure ==0)
{
tmrKronometre.Stop();
lstKayit.Items.Add("Süre Doldu"+DateTime.Now.TimeOfDay.ToString());
MessageBox.Show("Süre Doldu");
}
}
}
}