private void dataGridView1_Click(object sender, EventArgs e)
        {
            localhost.Service1 service = new localhost.Service1();
            BindingSource      source  = new BindingSource();

            service.ShowBySubject(cmbsubject.Text);
            source.DataSource        = service.ShowBySubject(cmbsubject.Text);
            dataGridView1.DataSource = source;
        }
        private void button1_Click(object sender, EventArgs e)
        {
            localhost.Service1 service = new localhost.Service1();
            bool isvalidSub;
            bool isvalidsubject;

            service.isValidSubject(cmbsubject.Text, out isvalidsubject, out isvalidSub);
            BindingSource source = new BindingSource();

            if (isvalidsubject)
            {
                service.ShowBySubject(cmbsubject.Text);
                source.DataSource        = service.ShowBySubject(cmbsubject.Text);
                dataGridView1.DataSource = source;
            }
            else
            {
                MessageBox.Show("Subject Not Registered");
            }
        }