public static string LayMaNLLonNhat()
{
string maNLMax = NguyenLieuDAO.LayMaNLLonNhat();
if (maNLMax != null)
{
int chuyenSo = int.Parse(maNLMax.Replace("NL", ""));
return("NL" + (chuyenSo + 1).ToString("000"));
}
return("NL001");
}