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copied!<p>Here are two things you could do: </p> <ol> <li>make GetResponseCallback not static, and <strong>store the xmlName in an instance variable</strong> </li> <li>pass a <strong>state object</strong> (anything that has a property named xmlName, and something else to identify it by) to the request, and you can get it from the <code>AsyncState</code></li> <li><p>change GetResponseCallback's function to the following, and make the <strong>whole thing a callback "factory"</strong></p> <pre><code>private static AsyncCallback GetResponseCallback(string xmlName) { return (IAsyncResult asynchronousResult) =>{ HttpWebRequest httpRequest = (HttpWebRequest)asynchronousResult.AsyncState; // End the operation HttpWebResponse response = (HttpWebResponse)httpRequest.EndGetResponse(asynchronousResult); Stream streamResponse = response.GetResponseStream(); StreamReader streamRead = new StreamReader(streamResponse); string responseStream = streamRead.ReadToEnd(); using (var store = IsolatedStorageFile.GetUserStoreForApplication()) { using (var istream = new IsolatedStorageFileStream(@"tmp" + xmlName + ".xml", FileMode.OpenOrCreate, store)) { using (var sw = new StreamWriter(istream)) { sw.Write(responseStream); } } } // Close the stream object streamResponse.Close(); streamRead.Close(); // Release the HttpWebResponse response.Close(); } } </code></pre></li> </ol> <p>EDIT to ADD:<br> the usage then changes to</p> <pre><code> httpRequest.BeginGetRequestStream(GetRequestStreamCallback(xmlName), httpRequest); </code></pre>

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