Problem With json In MVC

public JsonResult GetLawcategory()
        {
            
            List<lawcategory> _ListLawCategory = new List<lawcategory>();
            ArrayList aData = new ArrayList();
            var v = db.sp_GET_LAWCATEGORY();
            string strDesign = string.Empty;
            if (v != null)
            {
                foreach (var result in v)
                {
                    
                    LawCategory _LawCategory = new LawCategory();
                    _LawCategory.LawCategoryID = result.LawCategoryID;
                    _LawCategory.LawCategoryName = result.LawCategoryName;
                    _LawCategory.ParentCategory = result.ParentCategory;
                    _LawCategory.Status = result.Status;
                    _LawCategory.CountryName = result.CountryName;
                    //_ListLawCategory.Add(_LawCategory);
                    aData.Insert(aData.Count, _LawCategory);
                   

                }


            }
          
            return Json(aData, JsonRequestBehavior.AllowGet);

        }