how to consume wcf service with post method

[WebInvoke(Method = "POST", ResponseFormat = WebMessageFormat.Json, UriTemplate = "PostMailToClient/Data?ClientID={ClientID}&Email={Email}", BodyStyle = WebMessageBodyStyle.WrappedRequest)]
         public Stream PostMailToClient(string ClientID, string Email)
         {
             DataSet ds;
             DataAccessLibrary.clsDAL objEmail = new DataAccessLibrary.clsDAL();
             ds = objEmail.PostMailToClient(ClientID, Email);
             RestfulPrimaryServiceDatabase.Classes.clsClients objEmailClient = new Classes.clsClients();
             return dsEmailAPIToJSON(ds);
         }