Binding listbox and dropdown list using javascript - ASP.NET

we call a web service that return list<Employee> .

 $.ajax({

                type: "POST",

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

                url: "../WebServices/servicename.asmx/methodname",

                data: JSON.stringify({}),

                dataType: "json",

                success: BindEmployeeSucceeded,

                error: BindEmployeeFailed

            });

function BindEmployeeSucceeded(result) {

            var columns = result.d;

            $('#<%=lbEmployee.ClientID %>').empty();

            $('#<%=

lbEmployee

.ClientID %>').append('<option value="' + "0" + '">' + "Select" + '</option>');

            for (var i = 0; i < columns.length; i++) {

                $('#<%=

lbEmployee

.ClientID %>').append('<option value=' + columns[i].Id + '>' + columns[i].OrganisationName + '</option>');

            }

        }

        function BindEmployeeFailed() {

        }

note: OrganisationName and Id are properties of Employee