private void frmchitietmuonsach_Load(object sender, EventArgs e)
{
ChiTietPhieuMuon chitiet = new ChiTietPhieuMuon();
cbbmasach.DataSource = da.Convert(da.Query("Select ten from Sach"));
cbbnhaxuatban.DataSource = da.Convert(da.Query("select ten from Nhaxuatban"));
cbbtacgia.DataSource = da.Convert(da.Query("select ten from Tacgia"));
cbbtheloai.DataSource = da.Convert(da.Query("select ten from TheLoai"));
List <Object> lst = new List <object>();
lst = da.Convert(da.Query("select max(ma) from PhieuMuon"));
txtphieumuon.Text = lst[0].ToString();
if (txtphieumuon.Text != null)
{
chitiet.phieumuonma = txtphieumuon.Text;
DSChitietphieumuon.DataSource = da.Query("DanhSachChiTietPhieuMuon", new SqlParameter("@phieumuonma", chitiet.phieumuonma));
}
}