public class JsonCategoriesDisplay
    {
        public JsonCategoriesDisplay() { }

        public int CategoryID { set; get; }
        public string CategoryTitle { set; get; }
    }

    public class ArticleCategoryRepository
    {
        private DB db = new DB();  

        public IQueryable<JsonCategoriesDisplay> JsonFindAllCategories()
        {
            var result = from c in db.ArticleCategories                         
                         select new JsonCategoriesDisplay
                         {
                             CategoryID = c.CategoryID,
                             CategoryTitle = c.Title                            
                         };

            return result;
        }

          ....
    }




public class ArticleController : Controller
    {
        ArticleRepository articleRepository = new ArticleRepository();
        ArticleCategoryRepository articleCategoryRepository = new ArticleCategoryRepository();


        public string Categories()
        {
            var jsonCats = articleCategoryRepository.JsonFindAllCategories().ToList();

            //return Json(jsonCats, JsonRequestBehavior.AllowGet);

            return new JavaScriptSerializer().Serialize(new { jsonCats});
        }

    }

This results with following:

{"jsonCats":[{"CategoryID":2,"CategoryTitle":"Politika"},{"CategoryID":3,"CategoryTitle":"Informatika"},{"CategoryID":4,"CategoryTitle":"Nova kategorija"},{"CategoryID":5,"CategoryTitle":"Testna kategorija"}]}
If I use line that is commented and place JsonResult instead of returning string, I get following result:

[{"CategoryID":2,"CategoryTitle":"Politika"},{"CategoryID":3,"CategoryTitle":"Informatika"},{"CategoryID":4,"CategoryTitle":"Nova kategorija"},{"CategoryID":5,"CategoryTitle":"Testna kategorija"}]

But, I need result to be formatted like this:

{'2':'Politika','3':'Informatika','4':'Nova kateorija','5':'Testna kategorija'}

Is there a simple way to accomplish this or I will need to hardcode result?
Thanks in advance!