private void logOutToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.Dispose();
            frm_login login = new frm_login();

            login.Show();
        }
        private void logOutToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.Dispose();
            frm_login login = new frm_login();

            try
            {
                login.Show();
            }
            catch (InvalidOperationException)
            {
                login.Show();
            }
        }