public ActionResult ShowByBackCamera()
        {
            dtbs15Entities db = new dtbs15Entities();

            var c = (from b in db.BY_BackCamera16MP select b).ToList();

            BackCamera rpt = new BackCamera();

            rpt.Load();
            rpt.SetDataSource(c);
            Stream s = rpt.ExportToStream(CrystalDecisions.Shared.ExportFormatType.PortableDocFormat);

            return(File(s, "application/pdf", "BackCamera.pdf"));
        }