Getting Cities list in the form of DataSet using Zomato API

To get Cities list in the form of DataSet using Zomato API service..

     HttpWebRequest webRequest =
                    WebRequest.Create("https://api.zomato.com/v1/cities.xml")
                            as HttpWebRequest;

    HttpWebResponse webResponse = null;

    webRequest.Headers.Add("X-Zomato-API-Key", "KeyValue"); 
    //you can get KeyValue by registering with Zomato.
    webRequest.Method = "GET";

    webResponse = (HttpWebResponse)webRequest.GetResponse();

    if (webResponse.StatusCode == HttpStatusCode.OK)

    {

         StreamReader responseReader = new
                            StreamReader(webResponse.GetResponseStream());

         string responseData = responseReader.ReadToEnd();

         XmlDocument doc = new XmlDocument();

         doc.LoadXml(responseData);

         XmlNodeReader xmlReader = new XmlNodeReader(doc);

         DataSet ds = new DataSet();

         ds.ReadXml(xmlReader);

         return ds;

    }