private string QuerySoapWebService()
{
/*
StringBuilder soapRequestData = new StringBuilder();
soapRequestData.Append("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
soapRequestData.Append("<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">");
soapRequestData.Append("<soap:Body>");
soapRequestData.Append("<getOwners xmlns=\"http://WebXml.com.cn/\">");
soapRequestData.Append("</getOwners>");
soapRequestData.Append("</soap:Body>");
soapRequestData.Append("</soap:Envelope>");*/

/*
StringBuilder soapRequestData = new StringBuilder("");
soapRequestData.Append("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
soapRequestData.Append("<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\">");
soapRequestData.Append("<soap:Body>");
soapRequestData.Append(" <getContentNum xmlns=\"http://WebXml.com.cn/\">" );
soapRequestData.Append("<owner>" + 参数值1 + "</owner>");
soapRequestData.Append("<contentid>" + 参数值2 + "</contentid>");
soapRequestData.Append(" </getContentNum>");
soapRequestData.Append(" </soap:Body>");
soapRequestData.Append("</soap:Envelope>");*/

//发起请求
Uri uri = new Uri("输入url地址");
WebRequest webRequest = WebRequest.Create(uri);
webRequest.ContentType = "text/xml;charset=utf-8";
webRequest.Method = "POST";
webRequest.Headers.Add("SoapAction", "http://WebXml.com.cn/Request" );    // 与soapXML中的一致，需要加/Request
using (Stream requestStream = webRequest.GetRequestStream())
{
byte[] paramBytes = Encoding.UTF8.GetBytes(soapRequestData.ToString());
requestStream.Write(paramBytes, 0, paramBytes.Length);
}

//响应
//WebResponse webResponse = webRequest.GetResponse();
HttpWebResponse hwRes = webRequest.GetResponse() as HttpWebResponse;
//是否返回成功
if (hwRes.StatusCode == System.Net.HttpStatusCode.OK)
{
XmlDocument readXmlRes = ReadXmlResponse(hwRes);

XmlNodeList list = readXmlRes.SelectNodes("/Table/row");
}
else
{

}

return "";
}