Windows phone not working but android and IOS working fine

Hi All,

`private async Task GetStringDeserializedParms(string ServiceAddress, string FunctionName, object[] Parameters, object[] ParameterValues, string glbtoken)
{
try
{
OutputString = string.Empty;
var httpClient = new HttpClient();
var obj = new JObject();
for (int i = 0; i < Parameters.Length; i++)
{
obj[Parameters[i]] = ParameterValues[i] + "";
}

            string s = obj.ToString();

            httpClient.DefaultRequestHeaders.TryAddWithoutValidation("Accept", "application/json");

            httpClient.DefaultRequestHeaders.TryAddWithoutValidation("Accept-Charset", "UTF-8");

            httpClient.DefaultRequestHeaders.TryAddWithoutValidation("Authorization", glbtoken);

            String url = ServiceAddress + "/" + FunctionName;

            var response =  httpClient.PostAsync(new Uri(url), new StringContent(s, Encoding.UTF8, "application/json")).Result;

            response.EnsureSuccessStatusCode();
            using (var responseStream =  response.Content.ReadAsStreamAsync().Result)

            using (var streamReader = new StreamReader(responseStream))
            {
                getstring = streamReader.ReadToEnd().ToString();
                OutputString = (string)Newtonsoft.Json.JsonConvert.DeserializeObject(getstring);
            }

        }
        catch(Exception ex)
        {

        }


        return OutputString + "";
    }

`

The above code working fine in android device and Iphone devices but , In Windows phone not responding after this below line executed

** var response = httpClient.PostAsync(new Uri(url), new StringContent(s, Encoding.UTF8, "application/json")).Result;**

What i need is windows need to wait for response from service. After receiving the response only next line should execute.