public static void RedirectToLogin(Context context)
        {
            PreferenceHandler.setLoggedIn(false);
            PreferenceHandler.SetToken(string.Empty);
            PreferenceHandler.SetRefreshToken(string.Empty);
            Intent intent = new Intent(Application.Context, typeof(LoginNewActivity));

            intent.PutExtra(LoginNewActivity.KEY_SHOW_PAGE, (int)SignInType.SIGN_IN);
            context.StartActivity(intent);
        }
        public static async Task GetToken()
        {
            string tokenURL = string.Format(B2CConfig.TokenURL, B2CConfig.Tenant, B2CPolicy.SignInPolicyId, B2CConfig.ClientId, PreferenceHandler.GetAccessCode());
            var    response = await InvokeApi.Authenticate(tokenURL, string.Empty, HttpMethod.Post);

            if (response.StatusCode == System.Net.HttpStatusCode.OK)
            {
                string strContent = await response.Content.ReadAsStringAsync();

                var tokenNew = JsonConvert.DeserializeObject <AccessToken>(strContent);
                PreferenceHandler.SetToken(tokenNew.id_token);
                PreferenceHandler.SetRefreshToken(tokenNew.refresh_token);
            }
        }