datasource query question

[ShootingStar]

Hello

I'm quite newbie. I don't understand what is my problem exactly.
Following is my code.

$("#cmbCompany").width(350).kendoComboBox({

        placeholder: "Select company",

        serverFiltering: true,

        dataTextField: "Company",

        dataValueField: "ClientNo",

        dataSource: {

            transport: {

                read: "/Admin/GetAllCompany"

            }

        },

        change: function () {

            var value = this.value();

            if (value) {

                employeeDataSource.query({ companyNo: value });

                employee.enable();

            } else {

                employee.enable(false);

            }

 

          employee.value("");

        }

    });

     

    var employeeDataSource = new kendo.data.DataSource({

        transport: {

          dataType: "json",

          read: "/Admin/GetEmployeesByCompany"

        }

    });

 

    var employee = $("#cmbEmployee").width(300).kendoComboBox({

        autoBind: false,

        placeholder: "Select employee",

        dataTextField: "Name",

        dataValueField: "Email",

        dataSource: employeeDataSource

    }).data("kendoComboBox");

First time I select #cmbCompany combo box, it load data and shows propely at #cmbEmployee.
But second time, I select a new value at #cmbCompanyasd , it works nothing.
It did nothing, even not send http request.

How can I work it properly?

Thank you in advance.