private void linkLabel3_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
        {
            this.Hide();
            Login_Screen log = new Login_Screen();

            log.Show();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            Login_Screen lgc = new Login_Screen();

            this.Hide();
            lgc.Show();
        }