How do you disable caching with WebClient and Windows Phone 7

Question

I am making a call to a REST web service and the mobile app is retrieving the results from its cache and not going to the server.

I have seen other suggested fixes (

Answer 1

The most proposed solution is the same as William Melani's. But it is not ideal and some services reject requests with unknown parameters or any parameter. In this case it is cleaner and more reliable to use the IfModifiedSince header as follows:

    WebClient wc = new WebClient();
    wc.Headers[HttpRequestHeader.IfModifiedSince] = DateTime.UtcNow.ToString();
    wc.DownloadStringCompleted += wc_DownloadStringCompleted;
    wc.DownloadStringAsync(new Uri(bitstampUrl));