Need help : Model is null in the controller

See more:

C#

Ajax

MVC

JSON

Hi,

I am using the below code to achieve my functionality but i am not getting the model in the controller. Please help on the below issue.

var productCalcaulationModel = {
       ProductId: $('input[attributeName="ProductID"]').val(),
       DealWorkFlowProductID: $('input[attributeName="WorkFlowID"]').val(),
       ExistingTariff: $('input[attributeName="Existing Rate"]').val(),
       CalculationAttributes: '',
       SimpleAttributes: simpleAttributes
   };

   $.ajax({
       url: '/Hermes/Deposit/Edit',
       type: 'POST',
       data: JSON.stringify(productCalcaulationModel),
       datatype: 'json',
       //contentType: "application/json;charset=utf-8",
       success: function (data) {
           PopulateDealWorkflowDepositsTable(data, 'tableDepositDeal', false, -1, -1);
       },
       error: function (x, y, z) {
           alertify.error(genericErrorMessage);
           $('#loaderSelectProducts').css('display', 'none');
       }
   });

 [System.Web.Mvc.HttpPost]
        public JsonResult Edit(ProductCalculationModel model)
        {
//some code here for my functionality and returning the JsonResult

        }

public class ProductCalculationModel
   {
       public int ProductId { get; set; }

       public decimal ProposedTariff { get; set; }

       public decimal ExistingTariff { get; set; }

       public IList<PriceableProductAttribute> CalculationAttributes { get; set; }

       public IList<Attribute> SimpleAttributes { get; set; }

       public string ClientSegment { get; set; }

       public string DepositRowID { get; set; }

       public int DealWorkFlowProductID { get; set; }

       public ProductCalculationModel() { }
   }

I am not getting the model in the Edit method which i am sending from the ajax Json.