private void GUI_Diem_Load(object sender, EventArgs e)
{
dataGridView1.DataSource = busDien.GetDiem();
cbbMonHoc.DataSource = busDien.GetMonHoc();
cbbMonHoc.DisplayMember = "tenMonHoc";
cbbMonHoc.ValueMember = "maMonHoc";
cbbSinhVien.DataSource = busDien.GetSinHVien();
cbbSinhVien.DisplayMember = "tenSinhVien";
cbbSinhVien.ValueMember = "maSinhVien";
txtMaSV.Text = cbbSinhVien.SelectedValue.ToString();
txtMaMH.Text = cbbMonHoc.SelectedValue.ToString();
}
