Implement virtualisation in kendo drop down list using jquery ajax in mvc, aspx page

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virtualization helps to load huge data fastly.

$("#abcd").kendoDropDownList({
                filter: "contains",

                dataTextField: "WorkOrderNumber",
                dataValueField: "WorkOrderNumber",
                virtual: {
                    itemHeight: 26,
                    valueMapper: function (options) {

                    }
                },
                dataSource: {
                    transport: {
                        read: {
                            type: "GET",
                            url: 'WS_Equipment.asmx/GetWorkOrderID',
                            dataType: "json"
                        }
                    }
                },
                optionLabel: "Select WorkOrderID",
            }).data("kendoDropDownList").select(0);

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