public bool modifyItem(DataObj dataObj)
        {
            if (dataObj == null)
                return false;

            ExampleDatas person = context.TodoData.SingleOrDefault(p=> p.Id == dataObj.Id);
            person.Name = dataObj.Name;
            person.Description = dataObj.Description;
            person.Site = dataObj.Site;
            context.SaveChanges();

            return true;
        }
        public bool saveItem(DataObj dataObj)
        {
            if (dataObj == null)
                return false;

            ExampleDatas person = new ExampleDatas();
            person.Name = dataObj.Name;
            person.Description = dataObj.Description;
            person.Site = dataObj.Site;
            context.TodoData.Add(person);
            context.SaveChanges();

            return true;
        }