public void SuaThongTin(EC_PhieuThue EC_PT)
 {
     connect.ThucHienLenh("update tblPhieuThue set  MaKH = N'" + EC_PT.MaKH + "', MaPh = N'" + EC_PT.MaPh + "'  where MaPhieu = '" + EC_PT.MaPhieu + "'");
 }
 public void XoaTTPhieuThue(EC_PhieuThue EC_PT)
 {
     connect.ThucHienLenh("delete from tblPhieuThue where MaPhieu = '" + EC_PT.MaPhieu + "'");
 }
 public void ThemThongTin(EC_PhieuThue EC_PT)
 {
     connect.ThucHienLenh("insert into tblPhieuThue(MaPhieu, MaKH, MaPh) values(N'" + EC_PT.MaPhieu + "', N'" + EC_PT.MaKH + "', N'" + EC_PT.MaPh + "')");
 }