asp.net mvc - Ajax serialize with extra data MVC -

i use webgid display records have user. load webgrid in partilal view after user clicks on ajax actionlink.

  @ajax.actionlink(" ", "adduserelements", "users", new { username = item.username }, new ajaxoptions() { updatetargetid = "add_research"}, new { @class = "glyphicon glyphicon-link" }) 

in webgrid have delete action. when click delete modal appears ask verification. click on yes , record being deleted webgrid in partial view doesn't being refreshed. update partial view use in ajax code

  $("#add_research").load('/users/adduserelements'); 

i tried pass username serialize controller no lack

my ajax code

       $(function () {        $.ajaxsetup({ cache: false });        $("a[data-modal]").on("click", function (e) {        $('#mymodalcontent').load(this.href, function () {         $('#mymodal').modal({             keyboard: true         }, 'show');         bindform(this);     });     return false; }); });   function bindform(dialog) { $('form', dialog).submit(function () {     $('#progress').show();      var data = $(this).serialize() + '&' + $.param({ 'username': '@model.username' }, true);      $.ajax({         url: this.action,         type: "post",          data: data,          cache: false,          success: function (result) {             if (result.success) {                  $('#mymodal').modal('hide');                 $('#progress').hide();                $("#add_research").load('/users/adduserelements');               } else {                 $('#progress').hide();                 $('#mymodalcontent').html(result);                 bindform();             }         }     });     return false; });  } 

my controller

 public actionresult adduserelements(string username) 

any idea? thank you