Question

I am learning MVC2 and I am trying to create a data request management system. Somewhat like a ticketing system. A quick question, in my mvc controller class I have a post-create

    [HttpPost]
    public ActionResult Create(Request request)
    {

        if (ModelState.IsValid)
        {
            try
            {
                // TODO: Add insert logic here
                var db = new DB();
                db.Requests.InsertOnSubmit(request);

                db.SubmitChanges();
                return RedirectToAction("Index");
            }
            catch
            {
                return View(request);
            }

        }
        else
        {
            return View(request);
        }

    }

Ok, this is extremely simple enough, well I add my view and once I create a row I get the 0 first in my Primary Key row. Then it will not increment anymore, I goto add another row and the catch returns me to the same view I am on. It seems that the primary key int id is not incrementing.

How do you auto increment the id (type int) here? I am a bit confused why MVC isn’t handling this since it is the primary key type int. It will only make the first row with the id = 0 and that’s all.

Answer 1

Your ID column needs to be set as an Identity column in the table in SQL server.

Also you should create your DB data context in a using:

using(var db = new DB())
{
  db.Requests.InsertOnSubmit(request); 

  db.SubmitChanges(); 
  return RedirectToAction("Index"); 
}

Otherwise you’re spilling connections all over the place; and creating more memory leaks than an early build of windows (well, depending on your traffic 😉 )