asp.net mvc 3 - How to do Jquery ajax post to controller mvc -

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i can't figure out not doing right,from viewmodel,i try grab user {**tousername , messagebody},#tousername** correctly sent while #body null in controller when debug .i have following jquery code:

$("#sendmessage").click(function () {         var message = grabmessage();          var jsondata = json.stringify(message, null, 2);          $.ajax({             url: '@url.content("~/message/compose/")',             type: 'post',             data: jsondata,             datatype: 'json',             contenttype: 'application/json; charset=utf-8',             success: function () {                 $('#default_message').append("message sent ");                 switchtosentmessagestab();             },             error: function (request, status, err) {                 alert(status);                 alert(err);             }         });          return false;     });      function switchtosentmessagestab() {         $('a[href="#default_message"]').click();     }       function grabmessage() {         var touser = $("#tousername").val();         var text = $("#body").val();          var result =         {             body: text,             tousername: touser          };          return result;     }  });

and razer view:

@using (html.beginform()) { @html.validationsummary(true)      <div class="editor-label">         @html.labelfor(model => model.tousername)     </div>     <div class="editor-field">         @html.editorfor(model => model.tousername, new { @class ="autocomplete"})         @html.validationmessagefor(model => model.tousername)     </div>      <div class="editor-field">         @html.editorfor(model => model.body)         @html.validationmessagefor(model => model.body)     </div>      <p>         <input id="sendmessage" type="submit" value="send" />     </p>

} , controller action:

  [httppost]     public actionresult compose(privatemessageviewmodel m)      {         if (user.identity.isauthenticated )         {             if (modelstate.isvalid)             {                 var tousername = users.profiles.first(x => x.username == m.tousername);                 privatemessage message = new privatemessage                 {                     //do stuff here:                                     };                 db.sendmessage(message);                  return redirecttoaction(//some view here...)             }         }          return partialview(m);     }


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