public ActionResult SaveEvent(string EventID, string EventTitle, string EventVenue, string EventAddress1, string EventAddress2, string EventCity, string EventState, string EventPostalCode, DateTime EventStartDateTime, DateTime EventEndDateTime, string EventDescription) { Models.EventData eventData = new Models.EventData(); string saved = eventData.UpdateEvent(EventID, EventTitle, EventVenue, EventAddress1, EventAddress2, EventCity, EventState, EventPostalCode, EventStartDateTime.ToUniversalTime(), EventEndDateTime.ToUniversalTime(), EventDescription); if (saved.StartsWith("Point8020.Error")) { return(RedirectToAction("TrappedError", "Home", new { ErrorMessage = "Event could not be saved: Error Code is: " + saved, SPHostUrl = SharePointContext.GetSPHostUrl(HttpContext.Request).AbsoluteUri })); } else { var spContext = SharePointContextProvider.Current.GetSharePointContext(HttpContext); using (var clientContext = spContext.CreateUserClientContextForSPHost()) { if (clientContext != null) { hostWeb = clientContext.Web; clientContext.Load(hostWeb); ListCollection hostLists = hostWeb.Lists; clientContext.Load(hostLists); clientContext.ExecuteQuery(); bool calendarFound = false; foreach (List lst in hostLists) { if (lst.BaseTemplate == (int)ListTemplateType.Events) { if (lst.Title == "Contoso Events Calendar") { calendarFound = true; break; } } } eVentCalendarExists = calendarFound; if (calendarFound) { List calendar = hostWeb.Lists.GetByTitle("Contoso Events Calendar"); clientContext.Load(calendar); clientContext.ExecuteQuery(); CamlQuery camlQuery = new CamlQuery(); camlQuery.ViewXml = "<View><Query><Where><Eq><FieldRef Name='Category' /><Value Type='Text'>" + EventID + "</Value></Eq></Where></Query></View>"; ListItemCollection eventItems = calendar.GetItems(camlQuery); clientContext.Load(eventItems); clientContext.ExecuteQuery(); ListItem editEvent = eventItems[0]; editEvent["Title"] = EventTitle; editEvent["Location"] = EventCity; editEvent["EventDate"] = EventStartDateTime.ToUniversalTime(); editEvent["EndDate"] = EventEndDateTime.ToUniversalTime(); editEvent["Category"] = saved; editEvent.Update(); clientContext.ExecuteQuery(); } } return(RedirectToAction("Events", "Home", new { SPHostUrl = SharePointContext.GetSPHostUrl(HttpContext.Request).AbsoluteUri })); } } }