private void FormNNQuanLi_Load(object sender, EventArgs e)
{
gridViewNV.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill;
gridViewNN.AutoSizeColumnsMode = DataGridViewAutoSizeColumnsMode.Fill;
ey.LoadCTintoCombo(comboCT);
showDuLieuNV();
showDuLieuNN();
}