PUT api/{entitytype}/{id}

 
        //REQUEST  
        int id = id of the ticket to update
        string type = "changemanagementticket"
        string uri = string.Format("http://localhost/cgrestapi/api/{0}/{1}",id,type);
        HttpWebRequest webRequest = (System.Net.HttpWebRequest)System.Net.WebRequest.Create(uri);
        //Assumption: CGRestAPI is configured to use WIA. Otherwise, sessionid needs to be sent in the headers
        webRequest.Credentials = CredentialCache.DefaultCredentials;
        webRequest.Method = "POST";
        webRequest.ContentType = "application/json";
        var ticketData = JsonConvert.SerializeObject(new
                                                    {
                                                        Summary: 'New Summary',
  	                                                    eTag: 11 //this is returned on the get of an item.
                                                    }, Formatting.Indented);

        using (Stream dataStream = webRequest.GetRequestStream())
        {
            using (var streamWriter = new StreamWriter(dataStream))
            {
                using (var writer = new JsonTextWriter(streamWriter))
                {
                    writer.WriteRaw(ticketData);
                }
            }
        }
        HttpWebResponse httpWebResponse = (System.Net.HttpWebResponse)webRequest.GetResponse();
            
        //RESPONSE    
        HttpWebResponse httpWebResponse = (System.Net.HttpWebResponse)webRequest.GetResponse();
        Stream responseStream = httpWebResponse.GetResponseStream();
        using (var streamReader = new StreamReader(responseStream))
        {
            IDictionary responseData = new Hashtable();
            var result = JsonConvert.DeserializeObject(streamReader.ReadToEnd());
            if (result != null)
            {
                //do something here
            }
        }