WCF REST service with POST method code sample

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WCF

REST

Dear Experts,

I just need one code example for WCF REST service with POST method. I want to create a post method for taking a request parameter in JSON format and doing the service job. I need one sample example of this and one example of how to call this service method by sending request JSON data as parameter. Pls help me on this.

Below i am giving sample code of service as well as client call method. Where is wrong with this code please let me know.

[OperationContract]
    [WebInvoke(Method = "POST", ResponseFormat = WebMessageFormat.Xml, BodyStyle = WebMessageBodyStyle.Bare, UriTemplate = "CreateInventory/xml/{DatabaseName}")]
    Stream CreateInventory(string DatabaseName, Stream RequestJSONData);


 public Stream CreateInventory(string DatabaseNameWithAccountID, Stream RequestJSONData)
    {
        StreamReader read = new StreamReader(RequestJSONData);
        string RequestJSONFormat = read.ReadToEnd();
        //My Logic starts here
    }

Client Call
-------------------

string RequestJSONFormat = "Some JSON Data";
string requestURL = "ServiceURL";
            string bodyParams = RequestJSONFormat;
            ASCIIEncoding encoding = new ASCIIEncoding();
            HttpWebRequest request = WebRequest.Create(requestURL) as HttpWebRequest;
            request.Method = "POST";
            request.ContentType = "application/json";
            request.Timeout = 600000;
            string authString = string.Format("{0}", RequestJSONFormat);
            authString = Convert.ToBase64String(encoding.GetBytes(authString));
            authString = string.Format("Basic {0}", authString);
            request.CookieContainer = new CookieContainer();
            byte[] dataToSend = encoding.GetBytes(bodyParams);
            request.ContentLength = dataToSend.Length;
            request.Headers.Add("RequestJSONData", authString);
            request.GetRequestStream().Write(dataToSend, 0, dataToSend.Length);
            request.GetRequestStream().Close();
            StreamReader reader = new StreamReader(request.GetResponse().GetResponseStream(), true);
            string response = reader.ReadToEnd().ToString();