Azure AD graph api

var signInUserId = ClaimsPrincipal.Current.FindFirst(ClaimTypes.NameIdentifier).Value;
var userObjectId = ClaimsPrincipal.Current.FindFirst("http://schemas.microsoft.com/identity/claims/objectidentifier").Value;

string TenantIdClaimType = "http://schemas.microsoft.com/identity/claims/tenantid";
string tenantId = ClaimsPrincipal.Current.FindFirst(TenantIdClaimType).Value;
string upn = HttpContext.Current.User.Identity.Name;

Microsoft.IdentityModel.Clients.ActiveDirectory.AuthenticationContext ac = new Microsoft.IdentityModel.Clients.ActiveDirectory.AuthenticationContext(string.Format("https://login.windows.net/{0}", tenantId));
ClientCredential cc = new ClientCredential(SettingsHelper.ClientId, SettingsHelper.AppKey);
AuthenticationResult result = ac.AcquireToken("https://graph.windows.net", cc);

HttpClient client = new HttpClient();
string requestUrl = String.Format(
                                CultureInfo.InvariantCulture,
                                "https://graph.windows.net/{0}/users/{1}?api-version=2013-11-08",
                                HttpUtility.UrlEncode(tenantId), HttpUtility.UrlEncode(upn));
HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Get, requestUrl);
request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", result.AccessToken);
HttpResponseMessage response = client.SendAsync(request).Result;

User user = null; // Type "User" is a custom class with the userprofile properties
if (response.IsSuccessStatusCode)
{
  string responseString = response.Content.ReadAsStringAsync().Result;
  user = JsonConvert.DeserializeObject<User>(responseString);
}