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    copied!<p>You can use HttpWebRequest to call the web service API, XML library to convert the response string to .net Objects. Here is a simple example (it gets an error message "Invalid API access key supplied" as I don't have a valid key):</p> <pre><code> static void Main(string[] args) { HttpWebRequest req = (HttpWebRequest)HttpWebRequest.Create( @"http://www.ctabustracker.com/bustime/api/v1/gettime?key=89dj2he89d8j3j3ksjhdue93j" ); using (WebResponse resp = req.GetResponse()) { using (Stream respStream = resp.GetResponseStream()) { using(StreamReader reader = new StreamReader(respStream)) { String respString = reader.ReadToEnd(); Debug.WriteLine(respString); TestBusTimeResponse response = XmlUtil.DeserializeString&lt;TestBusTimeResponse&gt;(respString); Debug.WriteLine(response.Error.Message); } } } Console.ReadLine(); } </code></pre> <p>where XmlUtil.DeserializeString is defined as:</p> <pre><code> public static T DeserializeString&lt;T&gt;(String content) { using (TextReader reader = new StringReader(content)) { XmlSerializer s = new XmlSerializer(typeof(T)); return (T)s.Deserialize(reader); } } </code></pre> <p>and TestBusTimeResponse is defined as (You can actually generate this Business Object class with the XML schema, specified in the API document, using the <a href="http://msdn.microsoft.com/en-us/library/x6c1kb0s%28v=vs.90%29.aspx" rel="nofollow">xsd</a> utility shipped with VS):</p> <pre><code>[XmlRoot("error")] public class TestBusTimeResponseError { [XmlElement("msg")] public String Message { get; set; } } // Response in the following format: // &lt;?xml version="1.0"?&gt; // &lt;bustime-response&gt;&lt;error&gt;&lt;msg&gt;Invalid API access key supplied&lt;/msg&gt;&lt;/error&gt;&lt;/bustime-response&gt; [XmlRoot("bustime-response")] public class TestBusTimeResponse { [XmlElement("error")] public TestBusTimeResponseError Error { get; set; } } </code></pre>
 

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