Verify Facebook Access Token

gistfile1.cs

private async Task<FacebookUserViewModel> VerifyFacebookAccessToken(string accessToken)
{
    FacebookUserViewModel fbUser = null;
    var path = "https://graph.facebook.com/me?access_token=" + accessToken;
    var client = new HttpClient();
    var uri = new Uri(path);     
    var response = await client.GetAsync(uri);
    if (response.IsSuccessStatusCode)
    {
        var content = await response.Content.ReadAsStringAsync();
        fbUser = Newtonsoft.Json.JsonConvert.DeserializeObject<FacebookUserViewModel>(content);
    }
    //var response = await client.GetStringAsync(uri);
    //if ()
    //{
    //    fbUser = Newtonsoft.Json.JsonConvert.DeserializeObject<FacebookUserViewModel>(response);
    //}
    return fbUser;
}


public class FacebookUserViewModel
{
    [JsonProperty("id")]
    public string ID { get; set; }
    [JsonProperty("first_name")]
    public string FirstName { get; set; }
    [JsonProperty("last_name")]
    public string LastName { get; set; }
    [JsonProperty("username")]
    public string Username { get; set; }
    [JsonProperty("email")]
    public string Email { get; set; }
}