public Form1()
{
InitializeComponent();
pathDataNhom = Application.StartupPath + @"\Data\Nhom.data";
pathDataDanhBa = Application.StartupPath + @"\Data\DanhBa.data";
gridNhom.AutoGenerateColumns = false;
nhom = Nhom.GetListFromFile(pathDataNhom);
bds1.DataSource = nhom;
gridNhom.DataSource = bds1;
}