public async Task <List <HelloWorld> > GetAllAsync()
        {
            using (var context = new HelloWorldDbContext())
            {
                var result = await context.HelloWorlds.ToListAsync();

                return(result);
            }
        }
        public async Task <HelloWorld> CreateAsync(HelloWorld helloWorld)
        {
            using (var context = new HelloWorldDbContext())
            {
                context.HelloWorlds.Add(helloWorld);

                await context.SaveChangesAsync();

                return(helloWorld);
            }
        }