[HttpPost]
        public ActionResult Update(IEnumerable<Product> products)
        {
                //  ....
                //Return emtpy result
                return Json("");
        }

stiReportMain.Dictionary.Report.BusinessObjectsStore.Clear();
reportViewer.Report.BusinessObjectsStore.Clear();
stiReportMain.RegBusinessObject("MyCategory", "documents", list);
stiReportMain.Design();

stiReportMain.Dictionary.Report.BusinessObjectsStore.Clear();
reportViewer.Report.BusinessObjectsStore.Clear();
stiReportMain.RegBusinessObject("MyCategory", "documents", list);
stiReportMain.Dictionary.SynchronizeBusinessObjects();
stiReportMain.Compile();
stiReportMain.RenderWithWpf(true); //Or Render();

var observableQuery = query.ToObservable(scheduler: NewThreadScheduler.Default);

var observableQuery = query.ToObservable<int>(scheduler: NewThreadScheduler.Default);