How to send complex object through webservice in Flex 3 to .Net

Hi,

I am new to Flex and trying to pass a complex object(a object which have another object array collection as property) through Flex 3 to .Net WCF service. I tried all mean but no success. I can successfully send simple object but when trying to send complex object it throw error like "Server request error".

Please reply with sample code to pass complex object. I tried with both by importing webservice using Import Web service of Flex 3 and creating <mx:Webservice> object both way but could not get success.

Thanks in advance for help!!!!!!

Chandra