private void thêmSinhViênToolStripMenuItem_Click(object sender, EventArgs e)
{
Form fThemLop = new FormThemSinhVien();
fThemLop.MdiParent = this;
fThemLop.Show();
}
private void btnthem_Click(object sender, EventArgs e)
{
Form fthemsv = new FormThemSinhVien();
var isOk = fthemsv.ShowDialog();
if (isOk == DialogResult.OK)
{
resetDanhSachSinhVien();
}
}