void NapGiaoVien()
{
DataTable dt = new DataTable();
bus = new BUS_Diem();
dt = bus.showdata_GiaoVien();
var item = new Dictionary <string, string>();
foreach (DataRow dr in dt.Rows)
{
item.Add(dr["MaGV"].ToString(), dr["MaGV"].ToString() + " - " + dr["TenGV"].ToString());
}
cbMaGV.DataSource = new BindingSource(item, null);
cbMaGV.DisplayMember = "Value";
cbMaGV.ValueMember = "Key";
}
