private void button1_Click(object sender, EventArgs e)
        {
            localhost.Service1 ser = new localhost.Service1();
            bool isalreadyexist;
            bool isalreadyexistpassed;

            ser.IsTeacherAlreadyExists(txtusername.Text, txtpassword.Text, out isalreadyexist, out isalreadyexistpassed);
            if (isalreadyexist)
            {
                MessageBox.Show("Teacher already exists");
                txtemail.Text           = "";
                txtusername.Text        = "";
                txtpassword.Text        = "";
                txtconfirmpassword.Text = "";
                txtsecretcode.Text      = "";
            }
            else
            {
                if (txtpassword.Text == txtconfirmpassword.Text && txtpassword.Text.Length >= 6)
                {
                    if (txtsecretcode.Text.Length >= 4 && txtsecretcode.Text.Length <= 7)
                    {
                        ser.RegisterTeacher(txtusername.Text, txtpassword.Text, txtsecretcode.Text);
                        MessageBox.Show("Teacher Has Been Registered");
                        txtemail.Text           = "";
                        txtusername.Text        = "";
                        txtpassword.Text        = "";
                        txtconfirmpassword.Text = "";
                        txtsecretcode.Text      = "";
                    }
                    else
                    {
                        MessageBox.Show("Invalid Secret code ");
                    }
                }
                else
                {
                    MessageBox.Show("Invalid Password Length or mismatch password");
                }
            }
        }