public Form1()
 {
     InitializeComponent();
     SPenvoie.Open();
     SPreception.Open();
     CbxTrameOkay.Visible = false;
 }
        private void BtnTest_Click(object sender, EventArgs e)
        {
            SPenvoie.Write(tbxTest2.Text);

            /*tbxTest2.Text = ("non");
             *
             * string txt = tbxTest2.Text;
             * tbxTest2.Text = txt.Substring(2, 4);
             * bool Valid = Traitement(tbxTest2.Text);
             * if (Valid == true)
             * {
             *  CbxTrameOkay.Checked = true;
             * }
             * else
             * {
             *  CbxTrameOkay.Checked = false;
             * }*/
        }