public static NguoiDung_DTO LayNguoiDung(string ten, string matkhau)
{
MD5 md5Hash = MD5.Create();
string matkhauMH = NguoiDung_BLL.GetMd5Hash(md5Hash, matkhau);
return(NguoiDung_DAL.LayNguoiDung(ten, matkhauMH));
}