how to remove namespace notations from webservice response?

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I want to remove webservice notations from the response xml.\[code\] <ListMerchantsResponse xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://tempuri.org/"><Merchants><Merchant><Active>true</Active><Id>2</Id></Merchant></Merchants></ListMerchantsResponse> \[/code\]I want to this looks as\[code\] <ListMerchantsResponse> <Merchants> <Merchant> <Active>true</Active> <Id>2</Id> </Merchant> </Merchants></ListMerchantsResponse> \[/code\]Please give me some example code.