jquery syntax error on Ajax call to mvc controller

I am trying to make an ajax  call...that will grab the values off the page...and then pass those values in the URL to the controller.

Here is the ajax...its crapping out on the 2nd line starting with var allocation.

function UpdateContactEntity(clientxcontactId) {
    var allocation = $("#txtallocation" + clientxcontactId + ).val();
    alert(allocation);       
   $.ajax({
        alert("test");
        url: "/Contact.mvc/UpdateContactEntity?clientxcontactId=" + clientxcontactId + "?allocation=" +  allocation,
        type: 'GET',
        cache: false,
        dataType: 'json',
        data: { data: clientxcontactId },
        success: function (data) {
                var result = $.trim(data.Result);              
                ShowGridRedraw();
                },
        error: function (request, status, error) {
        alert(request.responseText);
        }     
     });
}

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For greater detail here is the other parts of my code:
Here is where I call it.

     [System.Web.Mvc.HttpGet]
        public JsonResult UpdateContactEntity(string data,int allocation)
        {
            var result = true;
            int clientxcontactId = data.ToInt32();
            IContactEntityEditService contactEntityEditService = DependencyResolver.Current.GetService<IContactEntityEditService>();

            var updated = contactEntityEditService.UpdateContactClient(clientxcontactId,allocation);

            result = updated;
            return Json(result, JsonRequestBehavior.AllowGet);
        }

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LVL 11
Robb HillSenior .Net DeveloperAsked:
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zephyr_hex (Megan)DeveloperCommented:
You don't need to concat the close parenthesis.

Change this:

var allocation = $("#txtallocation" + clientxcontactId + ).val();

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to this:
var allocation = $("#txtallocation" + clientxcontactId).val();

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