private void FrmThongTinCoBan_Load(object sender, EventArgs e)
{
XuLiNV xl = new XuLiNV();
vCn.DataSource = xl.hienThiBangCb();
cbmp.DataSource = xl.hienThiPB();
cbml.DataSource = xl.hienThiL();
cbmnv.DataSource = xl.hienThiBangCb();
cbmp.DisplayMember = "MaPB";
cbml.DisplayMember = "MaLuong";
cbmnv.DisplayMember = "MaNV";
cbmp.ValueMember = "MaPB";
cbml.ValueMember = "MaLuong";
cbmnv.ValueMember = "MaNV";
btnHuy.Enabled = false;
btnLuu.Enabled = false;
}