private void btnThem_Click(object sender, EventArgs e)
{
enable(true);
deleteText();
flag = true;
lueMaNV.Properties.DataSource = nvControl.getMaTenChucVuUCThemDangNhap();
lueMaNV.Properties.DisplayMember = "MANV";
lblMaDN.Text = frm.MaSoTuTang("ND", dnControl.getFullData());
}