void NapMonHoc()
{
DataTable dt = new DataTable();
bus = new BUS_Diem();
dt = bus.showdata_MonHoc();
var item = new Dictionary <string, string>();
foreach (DataRow dr in dt.Rows)
{
item.Add(dr["MaMH"].ToString(), dr["MaMH"].ToString() + " - " + dr["TenMH"].ToString());
}
cbMaMH.DataSource = new BindingSource(item, null);
cbMaMH.DisplayMember = "Value";
cbMaMH.ValueMember = "Key";
}
