How to call webservice using flex?

Question

Hello,
i want to call webservice in flex.i tryied following code.but it is not giving correct response.what is wrong with this code?
can anybody tell me ,how to call webservice in flex?
Code:
<mx:Script>
        <![CDATA[
public function button1_clickHandler(event):void
     ws.returnRecord(para1,para2);//i am sending two parameter to returnRecord service here
public function remotingCFCHandler(event:ResultEvent):void
trace(event.result);
]]>
</mx:Script>
<mx:WebService
     id="ws"
     wsdl="http://localhost:8500/flexapp/returnusers.cfc?wsdl">
    <mx:operation name="returnRecords" resultFormat="object"
     fault="mx.controls.Alert.show(event.fault.faultString)"
     result="remotingCFCHandler(event)"/>
<mx:Button label="Go" fontWeight="bold" click="button1_clickHandler(event)"/>

Answer 1

Hello sir,
i got following reply:
<returnRecordResponse  xmlns="http://xyz" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <returnResult>Error_request</returnResult>
</returnRecordResponse>
but correct response is
<returnRecordResponse  xmlns="http://xyz" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <returnResult>Success</returnResult>
</returnRecordResponse>
can you tell me correction in the code which i have put on the forum?or tell me other way to call webservice?