Web Api Client in Windows Forms

I'm making a client using Web Api. My site has the Web server function Api. I found this reference from Microsoft link which has an example client:

static async Task RunAsync()
{
    using (var client = new HttpClient())
    {
        client.BaseAddress = new Uri("http://localhost:9000/");
        client.DefaultRequestHeaders.Accept.Clear();
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

        // HTTP GET
        HttpResponseMessage response = await client.GetAsync("api/products/1");
        if (response.IsSuccessStatusCode)
        {
            Product product = await response.Content.ReadAsAsync<Product>();
            Console.WriteLine("{0}\t${1}\t{2}", product.Name, product.Price, product.Category);
        }...

The interesting thing is that the line below hangs and dies:

HttpResponseMessage response = await client.GetAsync("api/products/1");

Searching the internet, I implemented this code that works:

static async Task RunAsync()
{
    using (var client = new HttpClient())
    {
        client.BaseAddress = new Uri("http://localhost:17694/");
        client.DefaultRequestHeaders.Accept.Clear();
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));

        // HTTP GET
        HttpResponseMessage response = client.GetAsync("api/Integracao/GetAllProducts/").Result;
        if (response.IsSuccessStatusCode)
        {
            var product = response.Content.ReadAsStringAsync();
            var dados = JsonConvert.DeserializeObject<List<TipoPessoa>>(product.Result);                     
        }
        else
        {
            Console.WriteLine("Error");
        }
    }
}

My question is, what's the big difference between these two codes. Is my implementation acceptable?

Microsoft:

HttpResponseMessage response = await client.GetAsync("api/products/1");

My code:

HttpResponseMessage response = client.GetAsync("api/Integracao/GetAllProducts/").Result;