Not able to upload image to the server using web service in windows phone 8 app

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C#

Windows

C#4.0

JSON

I a new to windows development. I tried a lot to upload an image to the server, but I am unable to do so.

If anyone can help me out, please see my code below

void uploadphoto()
{
    WebClient webClient1 = new WebClient();
        webClient1.DownloadStringCompleted += new DownloadStringCompletedEventHandler(webClient1_DownloadStringCompleted);
    webClient1.DownloadStringAsync(new Uri("Web Service"));
}

void webClient1_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
{
        var rootobject1 = JsonConvert.DeserializeObject<RootObject1>(e.Result);
    int error = rootobject1.response.errorFlag;
        string message = rootobject1.response.msg;
    if (error == 0)
            {
                    MessageBox.Show(message);
            }
        else
            {
                    MessageBox.Show(message);
            }
}

public class Response1
{
        public int errorFlag { get; set; }
        public string msg { get; set; }
        public List<string> uploadedImageNames { get; set; }
}

public class RootObject1
{
        public Response1 response { get; set; }
}

And I am using the code below for selecting the image:

private void ImageUpload(object sender, RoutedEventArgs e)
    {
        //MessageBoxResult mb = MessageBox.Show("Select the mode of uploading the picture", "", MessageBoxButton.OKCancel);
        Popup popup = new Popup();
        photoSelection photo = new photoSelection();
        popup.Child = photo;
        popup.IsOpen = true;
        photo.camera.Click += (s, args) =>
            {
                photoCameraCapture.Show();
                popup.IsOpen = false;
            };
        photo.library.Click += (s, args) =>
            {
                photoChooserTask.Show();
                popup.IsOpen = false;
            };
}

I am using those code for developing app for Windows Phone 8. I am using Json.Net.Please help me out. Thanx in advance.