完成ajax请求asp.net mvc后无法打开twitter bootstrap模式

Question

$("#find").click(function () {
    var url = "/Home/SendMessage/" + $(this).val('email');

    $.ajax({
        type: 'GET',
        url: url,
        success: function (data) {
            $("#myModal").modal("show");
        },
        error: function (xhr, status, error) {
            alert(error);
        },
        dataType: 'text'
    });
});

<!-- Modal -->
<div class="modal fade" id="myModal" tabindex="-1" role="dialog" aria-labelledby="myModalLabel" aria-hidden="true">
    <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-header">
                <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
                <h4 class="modal-title" id="myModalLabel">Modal title</h4>
            </div>
            <div class="modal-body" id="myModalBody">
                You have just signed up for beta access!!
            </div>
            <div class="modal-footer">
                <button type="button" class="btn btn-default" data-dismiss="modal">Close</button>
                <button type="button" class="btn btn-primary">Save changes</button>
            </div>
        </div>
    </div>
</div>

ajax请求成功后，通过firebug检查没有任何事情发生。