jquery - how to send stringified Json from view to controller in MVC4 -

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i want send stringified json object on button click. trying follows... on button click able call required action method, it's passing null parameter..

memberlogin.cshtml

<input type="button" value="» continue" id="btnlogin" onclick="postdata();">  <script type="text/javascript">     function postdata() {         var objlogindto = new object();         objlogindto.username = $("#txtusername").val();         objlogindto.password = $("#txtmemberpassword").val();         objlogindto.captchatext = $("#txtcaptcha").val();         var stringifieddata = json.stringify(objlogindto);         $.ajax({             url: '@url.content("~/member/memberlogin/memberlogin")',             async: false,             type: "post",             data: stringifieddata,             datatype: "json",             contenttype: "application/json; charset=utf-8",             error: function (jqxhr, textstatus, errorthrown) {                 alert("error:" + jqxhr + "-" + textstatus + "-" + errorthrown);             },             success: function (data, textstatus, jqxhr) {                 alert("success:" + data.message);             }         });     } </script>

action method

[httppost]     public actionresult memberlogin(string jsonstr)     {         var objmemberlogindto =             new javascriptserializer().deserialize<memberlogindto>(jsonstr);     }

i getting null jsonstr. note:i have included json2.js. stringifieddata in ajax call holds stringified data. {"username":"test13361","password":"testpswd","captchatext":"gz8h4"}

'contenttype' property in $.ajax(...) config having problem. either remove contenttype set default or set proper content type. can find more on content type here

also @jai suggested, need wrap "data" in ajax(...) setting key-value pair key same of action method's parameter name proper modal-binding.


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