/// <summary>
        /// Ham khoi tao gia tri mac dinh cho cac bien
        /// </summary>
        private void init()
        {
            _draw   = Protector.Int(draw);
            _start  = Protector.Int(start);
            _length = Protector.Int(length);

            sortName = string.IsNullOrEmpty(sortName) ? "NV_ID" : sortName;
            sortDir  = string.IsNullOrEmpty(sortDir) ? "asc" : sortDir;
            _length  = _length < 1 ? 10 : _length;
            _loginId = Protector.Int(loginId);

            fields             = string.IsNullOrEmpty(fields) ? "" : fields;
            search             = string.IsNullOrEmpty(search) ? "" : search;
            _ngayTuyenDungFrom = Protector.DateTime(ngayFrom, "yyyyMMdd", true);
            _ngayTuyenDungTo   = Protector.DateTime(ngayTo, "yyyyMMdd", true);
            nhanVien           = string.IsNullOrEmpty(nhanVien) ? "" : nhanVien;
            phongBan           = string.IsNullOrEmpty(phongBan) ? "" : phongBan;
            duAn         = string.IsNullOrEmpty(duAn) ? "" : duAn;
            chucVu       = string.IsNullOrEmpty(chucVu) ? "" : chucVu;
            _dangLamViec = string.IsNullOrEmpty(dangLamViec) ? null : Protector.Bool(dangLamViec, true, true);
            maForm       = string.IsNullOrEmpty(maForm) ? "" : maForm;
            maTrangThai  = string.IsNullOrEmpty(maTrangThai) ? "" : maForm;
        }