public JsonResult CreateActivity(ActivityModel model)
        {
            if (!ModelState.IsValid)
            {
                return Json(new
                {
                    Result = "ERROR",
                    Message = "Form is not valid! " +
                    "Please correct it and try again."
                });
            }

            try
            {
                JourListDMContainer dm = new JourListDMContainer();

                Activity newActivity = new Activity();
                newActivity.Points = model.Points;
                newActivity.Description = model.Description;
                newActivity.Unit = dm.Units.Single(z => z.Id == model.UnitId);
                newActivity.Quantity = model.Quantity;
                dm.AddToActivities(newActivity);
                dm.SaveChanges();

                model.Id = newActivity.Id;

                return Json(new { Result = "OK", Record = model });
            }
            catch (Exception e)
            {
                return Json(new { Result = "ERROR", Message = e.Message });
            }
        }