How to pass multiple parameter using json in mvc4?

Hi i want to pass Multiple parameter using json . I have four fields in my View FromDate, ToDate, CustomerName, Count. if i select the FromDate. ToDate, CustomerName and click the ok button it have calculate and display the value in Count Textbox as per value selected in FromDate, ToDate ,CustomerName

My Controller

[HttpGet]

public ActionResult NewExistingCustomer( CustomerViewModel cvm)

{

ViewBag.CustomerID = new SelectList(db.Customers, "CustomerID", "DisplayName");

return View();

}

public JsonResult GetCustomers()

{

return Json(db.Customers.ToList(), JsonRequestBehavior.AllowGet);

}

public JsonResult GetSalesOrderCountByCustomer(Guid customerID, DateTime fromdate, DateTime Todate)

{

var salescount = (from sc in db.SalesOrders where sc.CustomerID == customerID && sc.CreatedDate == fromdate && sc.CreatedDate == Todate select sc.SalesOrderID).Count();

return Json(salescount, JsonRequestBehavior.AllowGet);

}

Here i calculate the SalesOrderCount from SalesOrderTable depend upon getting values of FromDate ToDate CustomerName from View and then i display the value in Count Textbox.

But it is not working. I donno where i did mistake . Please any one cross check my code again , it showing error

Error

 

 

 

 

 

My View

My Jquery

function ok() {

var customerID = $("#CustomerID").val();

var fromdate = $("#FromDate").val();

var Todate = $("ToDate").val();

var ordercount = { "CustomerID": customerID, "FromDate": fromdate, "ToDate": Todate };

$.ajax(

'@Url.Action("GetSalesOrderCountByCustomer", "Report")', {

type: "GET",

contentType: "application/json; charset=utf-8",

dataType: "json",

async: false,

data: JSON.stringify(ordercount),

error: function (ex) {

alert('Failed to retrieve Email.' + ex);

},

beforeSend: function () {

},

success: function (data) {

$("#count").val(data);

}

});

}

Advance Thanks..