private void btnback_Click(object sender, EventArgs e)
        {
            EmployeeManagement em = EmployeeManagement.getInstance();

            em.Show();
            this.Hide();
        }
        private void button1_Click(object sender, EventArgs e)
        {
            EmployeeManagement emplist = EmployeeManagement.getInstance();

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