optimistic-concurrency

I would like to do a check-then-update in an atomic operation. I am using dbcontext to manage the transaction. I was expecting to get an exception if the record has been modified by another thread but no exception is thrown. Any help would be appreciated. Here's my output: Thread-4: Reading... Thread-5: Reading... Thread-5: Updating destination 1 Thread-4: Updating destination 1 Thread-4: SaveChanges Thread-5: SaveChanges Here's my code snippet: public static void Main(string[] args) { PopulateData(); (new Thread(UpdateDestination1)).Start(); (new Thread(UpdateDestination1)).Start(); } public

How should I solve simulation update, when one user updates already updated entery by another user? First user request 'Category' entityobject, second user does the same. Second user updates this object and first user updates. I have field timestamp field in database that wa set to Concurrency Mode - Fixed. This is how I update: public class CategoriesRepository : BaseCategoryRepository { public void Update(....) { try { Category catToUpdate = (from c in Contentctx.Categories where c.CategoryID == categoryId select c).FirstOrDefault(); catToUpdate.SectionReference.EntityKey = new System.Data

I have a middle tier which performs CRUD operations on a shared database. When I converted the product to .NET Core I thought I'd also look at using REST for the API as CRUD is supposed to be what it does well. It seems like REST is a great solution for single record operations, but what happens when I want to delete, say, 1,000 records? Every professional multi-user application is going to have some concept of Optimistic Concurrency checking: you can't have one user wipe out the work of another user without some feedback. As I understand it, REST handles this with the HTTP ETag header record.

i have the following action method inside my asp.net mvc web application , which will raise a DbUpdateConcurrencyException as intended to handle any concurrent conflicts that might happen:- [HttpPost] public ActionResult Edit(Assessment a) { try { if (ModelState.IsValid) { elearningrepository.UpdateAssessment(a); elearningrepository.Save(); return RedirectToAction("Details", new { id = a.AssessmentID }); } } catch (DbUpdateConcurrencyException ex) { var entry = ex.Entries.Single(); var clientValues = (Assessment)entry.Entity; ModelState.AddModelError(string.Empty, "The record you attempted to