private void btnShow_Click(object sender, EventArgs e)
{
localhost.Service1 ser = new localhost.Service1();
bool isvalidSub;
bool isvalidsubject;
ser.isTeacherValidSubject(cmbSubject.Text, out isvalidsubject, out isvalidSub);
BindingSource source = new BindingSource();
if (isvalidsubject)
{
source.DataSource = ser.TeacherViewDMC(cmbSubject.Text);
ser.TeacherViewDMC(cmbSubject.Text);
dataGridView1.DataSource = source;
}
else
{
MessageBox.Show("Invalid subject");
}
}