.net xml序列化

- <response xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <Hmac>e7a9e12bf345aaee06d2ef48891a726c</Hmac> 
  <RequestId>1002000</RequestId> 
  <MerchantId>XB100</MerchantId> 
  <ReturnCode>01245sd3124</ReturnCode> 
  <Goods>asd</Goods> 
- <goodsinfo>
- <goods>
  <title>他她 新款黑改色牛皮男鞋 黑色</title> 
  <serialnum>001-11</serialnum> 
  <type>2</type> 
  <price>1.00</price> 
  <brand>他她</brand> 
- <morecolor>
  <color>虚拟颜色</color> 
  <color>虚拟颜色</color> 
  <color>虚拟颜色</color> 
  <color>虚拟颜色</color> 
  <color>虚拟颜色</color> 
  </morecolor>
  <desc>他她 新款黑改色牛皮男鞋 黑色</desc> 
  <image>95/16/44/001-11/MainDemo/001-112926.jpg</image> 
- <moreimg>
  <img>虚拟颜色</img> 
  <img>虚拟颜色</img> 
  <img>虚拟颜色</img> 
  <img>虚拟颜色</img> 
  <img>虚拟颜色</img> 
  </moreimg>
  </goods>
  </goodsinfo>
  </response>我在序列化怎么去掉response节点中的 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema"这部分内容啊，求大神帮助啊啊