private void btnThemNV_Click(object sender, EventArgs e)
{
frm_AddNhanVien frm_Add = new frm_AddNhanVien();
frm_Add.ShowDialog();
HienThiDanhSachNV();
}
private void btnSuaNV_Click(object sender, EventArgs e)
{
string manv = "";
frm_AddNhanVien frm_Update = new frm_AddNhanVien();
manv = "" + dgrNhanVien.CurrentRow.Cells[0].Value;
frm_Update.MaNV = manv;
frm_Update.ShowDialog();
HienThiDanhSachNV();
}