public ActionResult SaveDraft(FormCollection form)
{
    // TODO: Save the form values and return a JSON result 
    // to indicate if the save went succesfully
    return Json(new { success = true });
}

在您的视图中,只需定期调用此操作：

setInterval(function() {
    $('#theFormToSave').ajaxSubmit({ 
        url    : 'SaveDraft',success: function (data,textStatus) {
            if (data.success) {
                alert('form successfully saved');
            }
        }
    });
},30000);