انتخاب Button پیش فرض

بسم الله الرحمن الرحیم

<script type="text/javascript">
         var ButtonKeys = { "EnterKey": 13 };
         $(function() {
             $("#MainForm").keypress(function(e) {
if (e.which == ButtonKeys.EnterKey) {
var defaultButtonId = $(this).attr("defaultbutton");
                     $("#" + defaultButtonId).click();
return false;
                 }
             });
         });
</script>
<% using (Html.BeginForm("DefaultButtonTest", "Home", FormMethod.Post,
new { defaultbutton = "SubmitButton",id="MainForm" })){%>
    <%= Html.TextBox("test")%>
  <input type="submit" name="btnSubmit" id="SubmitButton" value="Submit" />
<%}%>

<form action="/Home/DefaultButtonTest" defaultbutton="SubmitButton"
id="MainForm" method="post">
<input id="test" name="test" type="text" value="" />
<input type="submit" name="btnSubmit" id="SubmitButton" value="Submit" />
<input type="submit" name="btnSubmit" id="CancelButton" value="Cancel" />
</form>