The code copy is as follows:
$("#<%=lstCarBrand.ClientID%>").change(function () {
$("#<%=txtCarSeries.ClientID%>").val("");//Clear the text box
$("#<%=txtCarSeries.ClientID%>").unautocomplete();//Clear autocomplete
$("#<%=txtCarSeries.ClientID%>").autocomplete('Ajax/AjaxCusCarEssentialVersion.aspx', {//Add autocomplete
width: 200,
multiple: false,
matchContains: true,
extraParams: {//Passed parameters
"CarBrand": function () {
return $("#<%=lstCarBrand.ClientID%>").val();
}
}
});
});