private void EpurerNomPrenom(object sender, EventArgs e)
        {
            string chaine,
                    temp = "";

            chaine = ((TextBox)sender).Text.TrimStart();
            chaine = chaine.ToLower();

            try
            {
                System.Globalization.CultureInfo cultureInfo =
                                        System.Threading.Thread.CurrentThread.CurrentCulture;
                System.Globalization.TextInfo TextInfo = cultureInfo.TextInfo;
                temp = TextInfo.ToTitleCase(chaine);
            }
            catch
            {
                temp = chaine;
            }
            ((TextBox)sender).Text = temp;

        }