Send data from jquery ajax request not working

Question

I have a post request from jquery ajax to a ActionResult method as follow :

$("#itemTextbox, #itemTextboxNew, #quantity1Textbox").on("keydown", function (e) {
if ((e.keyCode == 120){
   var GetReportLast5SellAndBuyURL="/Trd/SellInvoice/GetReportLast5SellAndBuy";
   itemCode = $(this).val();
   $.ajax({
        type: "POST",
        url: GetReportLast5SellAndBuyURL,
        data: {ItemCode:itemCode},
        //contentType: "application/json; charset=utf-8",
        context: this,
        processData: false
    }).done(function (msg) { ... somethings ...});}

And in controller, ActionResult is :

    [HttpPost]
    public ActionResult GetReportLast5SellAndBuy(string ItemCode)
    { ... somthings ...}

But when ActionResult is called " ItemCode " is null... What's wrong with this chapter?

I tried different forms of this recipe, but the problem is still there..

Answer 1

try this:

 $.ajax({
        type: "POST",
        url: GetReportLast5SellAndBuyURL,
        data: JSON.stringify({ItemCode:itemCode}),
        datatype: "JSON",
        contentType: "application/json; charset=utf-8",
        processData: false
    }).done(function (msg) { ... somethings ...});}