private void frmXuatPhieuNhap_Load(object sender, EventArgs e)
{
PhieuNhapSach report = new PhieuNhapSach();
report.SetDataSource(PhieuNhapCtr.XuatPhieuNhapSach(mapn));
crpvXuatPhieuNhap.ReportSource = report;
}