private void bbsave_Click(object sender, EventArgs e)
        {
            bool isF;
            bool isFF;

            localhost.Service1 ser = new localhost.Service1();
            ser.SetPasswordTeacher(txtusername.Text, txtsecret.Text, out isF, out isFF);
            if (isF == true)
            {
                TeacherResetPassword rf = new TeacherResetPassword();
                this.Hide();
                rf.Show();
            }
            else
            {
                MessageBox.Show("wrong code");
            }
        }