Silverlike

This coding below demonstrated how you can POST data to the target remote server. Terence Tsang also provided a simple sample letting you to search the feed items of your blog (Only works for Wordpress).

If you are new to Silverlight networking,  remember to check out Network Security Access Restrictions in Silverlight.

// Create a request object
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(new Uri(POST_ADDRESS, UriKind.Absolute));
request.Method = "POST";
// don't miss out this
request.ContentType = "application/x-www-form-urlencoded";
request.BeginGetRequestStream(new AsyncCallback(RequestReady), request);  

// Sumbit the Post Data
void RequestReady(IAsyncResult asyncResult)
{
    HttpWebRequest request = asyncResult.AsyncState as HttpWebRequest;
    Stream stream = request.EndGetRequestStream(asyncResult);  

    // Hack for solving multi-threading problem
    this.Dispatcher.BeginInvoke(delegate()
    {
        // Send the post variables
        StreamWriter writer = new StreamWriter(stream);
        writer.WriteLine("key1=value1");
        writer.WriteLine("key2=value2");
        writer.Flush();
        writer.Close();  

        request.BeginGetResponse(new AsyncCallback(ResponseReady), request);
    });
}  

// Get the result  from the server
void ResponseReady(IAsyncResult asyncResult)
{
    HttpWebRequest request = asyncResult.AsyncState as HttpWebRequest;
    HttpWebResponse response = (HttpWebResponse)request.EndGetResponse(asyncResult);  

    this.Dispatcher.BeginInvoke(delegate()
    {
        Stream responseStream = response.GetResponseStream();
        StreamReader reader = new StreamReader(responseStream);
        // get the result text
        string result = reader.ReadToEnd();
    });
}