finaldata = [
            {
                "fromData": [
                    {
                        "STNAME": "North America",
                        "STADD1": "Route South",
                        "STCITY": " wer",
                        "STSTAT": "NJ",
                        "STZIPC": "3465",
                        "STCNTY": "USA"
                    }
                ],

            }
        ];
        $http.post('../services/GettRates.aspx', { msg: finaldata }).
          success(function (data, status, headers, config) { }).
          error(function (data, status, headers, config) { });

if (Request.HttpMethod == "POST")
    {
        string text = Request.Form["msg"];
        Response.Output.WriteLine(text);
    }