public class JsonParamModel    {        /// <summary>        /// json key        /// </summary>        public string JsonKey { get; set; }        /// <summary>        /// json object        /// </summary>        public dynamic JsonObj { get; set; }    }

  [HttpPost]        public Result WebapiDynamic(JsonParamModel json)

 $.ajax({                type: "POST",                contentType: "application/json",                dataType: "json",                url: $("#url").val(),                data: JSON.stringify({"JsonKey": "13", "JsonObj": { "Key1": "11", "Key2": "-10" } }),                success: function (results) {                    if (typeof results == "object") {                        JSON.stringify(results);                    }                    else {                        var resultObj = JSON.parse(results);                    }                                   },                error: function (XMLHttpRequest, textStatus, errorThrown) {                    alert(XMLHttpRequest.responseText);                }            });