C# Restful Service Using WebInvoke POST method

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C#

REST

webservice

Hi Dear:

I am developing a Restful service in C# and working well when I us

[OperationContract]
        [WebInvoke(Method = "GET", ResponseFormat = WebMessageFormat.Xml, BodyStyle = WebMessageBodyStyle.Wrapped, UriTemplate = "json/?id={id}")]
        string jdata(string id);

and my corrsponding function implementation is:

public string json(string id)
{
     return "You Typed : "+id;
}

Up to here all works well,
but when I change WenInvoke Method="POST" I have to face a "Method NOT Allowed.";

[WebInvoke(Method = "POST", ResponseFormat = WebMessageFormat.Xml, BodyStyle = WebMessageBodyStyle.Wrapped, UriTemplate = "json/?id={id}")]
        string jdata(string id);

Please Reply to resolve my problem.
Thanks.