//добавляем конец сессии при закрытии формы
private void pharm_FormClosed(object sender, FormClosedEventArgs e)
{
WebRequest req = WebRequest.Create(String.Format("http://localhost/exit.php?id_session={0}", id_ses));
WebResponse resp = req.GetResponse();
enter en = new enter();
en.Show();
}
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
// Application.Run(new enter());
enter form1 = new enter();
form1.Show();
Application.Run();
}