private void showbutton_Click(object sender, EventArgs e)
{
//dataGridView1.DataSource = m.List;
//BoxSort();
int id = (int)dataGridView1.SelectedRows[0].Cells[0].Value;
Student sv = GetSV(id);
Form2 f2 = new Form2();
f2.Show();
f2.textc(sv);
}
