private static string Analysis(string strResult)

 {

 　　var doc = new System.Xml.XmlDocument();

    //加载soap文件,文件格式如：strResult

    doc.LoadXml(strResult);

    string q1 = doc.DocumentElement["soap:Body"]["SendSmsResponse"].InnerXml;//该处是否必须，请各位大侠自己测试

    doc.LoadXml(q1);

    //xml 命名空间

    XmlNamespaceManager xmlns = new XmlNamespaceManager(doc.NameTable);

    //xml 命名空间缩写

    xmlns.AddNamespace("H", "http://www.yysms.com/");

   //获取xml文件<StatusCode></StatusCode>节点下的文本值

   var s = doc.SelectSingleNode("/H:SendSmsResult/H:StatusCode", xmlns).InnerText;

   return s

}

<?xml version="1.0" encoding="utf-8"?>

<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:xsd="http://www.w3.org/2001/XMLSchema">

     <soap:Body>

    <SendSmsResponse xmlns="http://www.yysms.com/">

       <SendSmsResult>

         <PayType></PayType>

         <StatusCode>OK</StatusCode>

         <Description>操作成</Description>

         <MsgId></MsgId>

         <SuccessCounts></SuccessCounts>

         <BillingCount></BillingCount>

         <Amount></Amount>

         <Balance></Balance>

         <BillingAmount></BillingAmount>

         <Errors />

           </SendSmsResult>

    </SendSmsResponse>

    </soap:Body>

</soap:Envelope>