string类型的XML值如何从入到数据库中

我从数据库中拿到值解析xml  HttpPost 过来 以下这个方法进行接收 
现在xmlData 里边的值是string 类型的 xmllogistics_interface=<RSS version="2.0"><BatchQueryResponse><clientID>TW</clientID><logisticProviderID>YTO</logisticProviderID><txLogisticID>LP2005082300225709000</txLogisticID><tradeNo>2005082300225709</tradeNo><mailNo>0571115987</mailNo><flag>1</flag><name>张三</name><address>华星科技大厦9层</address><postCode>266000</postCode><phone>231234134</phone><mobile>13575745195</mobile><prov>陕西省</prov><city>西安</city><sendStartTime>2011-05-13 13:16:00</sendStartTime><sendEndTime>2011-05-13 13:14:00</sendEndTime><itemName>Nokia N73</itemName><number>2</number><special>0</special><re>YTO</re><insuranceValue>0.0</insuranceValue><packageOrNot>0</packageOrNot></BatchQueryResponse></RSS>&data_digest=QG4B8aXGX753O+X8R31qng==<RSS version="2.0"><BatchQueryResponse><clientID>TW</clientID><logisticProviderID>YTO</logisticProviderID><txLogisticID>LP2005082300225709000</txLogisticID><tradeNo>2005082300225709</tradeNo><mailNo>0571115987</mailNo><flag>1</flag><name>张三</name><address>华星科技大厦9层</address><postCode>266000</postCode><phone>231234134</phone><mobile>13575745195</mobile><prov>陕西省</prov><city>西安</city><sendStartTime>2011-05-13 13:16:00</sendStartTime><sendEndTime>2011-05-13 13:14:00</sendEndTime><itemName>Nokia N73</itemName><number>2</number><special>0</special><re>YTO</re><insuranceValue>0.0</insuranceValue><packageOrNot>0</packageOrNot></BatchQueryResponse></RSS>  public void ResponseData()
    {
        string request;
        string xmlData;
        //接收传递过来的数据流
        using (Stream MyStream = Request.InputStream)
        {
            byte[] data = new byte[MyStream.Length];
            MyStream.Read(data, 0, data.Length);
            //从当前流读取数据
            MyStream.Read(data, 0, data.Length);
            request = Encoding.UTF8.GetString(data);
            xmlData = HttpUtility.UrlDecode(request);
        }
        Response.Write(xmlData);
        Response.End();
    }如何将xmlData存入数据库中，望大家协助。