Passing a list of objects from view to controller via jquery ajax(Json(aspx) -> object(C#))

public ActionResult SavePayment(List<PaymentPostingChargeEntry> lineItems)
{
return Content("");
}

$.ajax({
type: "GET",
url: '/DataEntry/PaymentPosting/SavePayment',
data: { lineItems: lineItems },
dataType: "html",
success: function(result) {
$("#PaymentMain").html(result);
},
error: function(error) {
alert(error);
}
});

lineItems = { "lineItems[0].Approved": "1.0", "lineItems[0].Deductible": "1.0", "lineItems[0].Coinsurance": "1.0", "lineItems[0].PaymentAmount": "1.0", "lineItems[0].VisitId": "1.0", "lineItems[0].VisitChargeId": "1.0" };

public class PaymentPostingChargeEntry
{
public string Approved { get; set; }
public string Deductible { get; set; }
public string Coinsurance { get; set; }
public string PaymentAmount { get; set; }
public string VisitId { get; set; }
public string VisitChargeId { get; set; }
}

<script src="<%= Url.Content("~/Scripts/jquery-1.3.2.min.js") %>" type="text/javascript"></script>
<script src="<%= Url.Content("~/Scripts/jquery.json-2.2.min.js") %>" type="text/javascript"></script>
<script type="text/javascript">
function savePayment() {
//Creating some test data
var lineItems = new Object();
lineItems.Entrys = new Array();
lineItems.Entrys[0] = new Object({ Approved: "1.0", Deductible: "1.0", Coinsurance: "1.0", PaymentAmount: "1.0", VisitId: "1.0", VisitChargeId: "1.0" });
lineItems.Entrys[1] = new Object({ Approved: "2.0", Deductible: "2.0", Coinsurance: "2.0", PaymentAmount: "2.0", VisitId: "2.0", VisitChargeId: "2.0" });

//Posting them to server with ajax
$.ajax({
type: 'POST',
contentType: 'application/json; charset=utf-8',
url: '<%=Url.Action("SavePayment", "Home") %>',
dataType: 'json',
data: $.toJSON(lineItems),
success: function(result) {
if (result) {
alert('Success');
}
else {
alert('Failure');
}
}
});
}
</script>

/// <summary>
/// Model binder which allows binding JSON data to objects
/// </summary>
public class JsonModelBinder : IModelBinder
{
#region IModelBinder Members
public object BindModel(ControllerContext controllerContext, ModelBindingContext bindingContext)
{
if (controllerContext == null)
throw new ArgumentNullException("controllerContext");
if (bindingContext == null)
throw new ArgumentNullException("bindingContext");

var serializer = new DataContractJsonSerializer(bindingContext.ModelType);
return serializer.ReadObject(controllerContext.HttpContext.Request.InputStream);
}
#endregion
}

[DataContract]
[ModelBinder(typeof(JsonModelBinder))]
public class PaymentPostingChargeEntrys
{
[DataMember]
public List<PaymentPostingChargeEntry> Entrys { get; set; }
}

[AcceptVerbs(HttpVerbs.Post)]
public ActionResult SavePayment(PaymentPostingChargeEntrys lineItems)
{
return Json(true);
}