const string client_id = "6ba3d4e99c1b4c61bc69328c53ea7093";
            const string redirect_uri = "https://localhost";
            const string request_uri = "https://api.instagram.com/oauth/authorize/?client_id=" +
                client_id + "&redirect_uri=" + redirect_uri + "&response_type=code";

            Uri requestUri = new Uri(request_uri);
            Uri callbackUri = new Uri("https://localhost");

            WebAuthenticationResult result = await WebAuthenticationBroker.AuthenticateAsync(WebAuthenticationOptions.None, requestUri, callbackUri);
 
            switch (result.ResponseStatus)
            {
                case WebAuthenticationStatus.ErrorHttp:
                    MessageDialog dialogError = new MessageDialog("Не удалось открыть страницу сервиса\n" +
                "Попробуйте войти в приложения позже!", "Ошибка");
                    dialogError.ShowAsync();
                    break;
                case WebAuthenticationStatus.Success:
                    string responseString = result.ResponseData;
                    MessageDialog dialogSuccess = new MessageDialog(responseString);
                    dialogSuccess.ShowAsync();
                    break;
            }