public frmDSHocSinh()
{
InitializeComponent();
BllGV = new BLL.GiangVien(this);
}
public frmSua()
{
InitializeComponent();
BLLgiangvien = new BLL.GiangVien(this);
}
public frm_Them()
{
InitializeComponent();
bllGV = new BLL.GiangVien(this);
}