//创建HttpWebRequest 实例，使用WebRequest.Create

HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create("服务地址");

//发送请求

webRequest.Method = "POST";

//编码

webRequest.ContentType = "text/xml";

string soap = "<?xml version=\"1.0\" encoding=\"utf-8\"?>";

soap += "<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/\">";

soap += " <soap:Header>";

soap += " <SoapHeader xmlns=\"http://www.52taiqiu.com/\">";

soap += " <Login>" + txtUser.Text + "</Login>";

soap += " <Password>" + txtPwd.Text + "</Password>";

soap += " </SoapHeader>";

soap += " </soap:Header>";

soap += "<soap:Body>";

soap += " <Request xmlns=\"http://www.52taiqiu.com/\">";

soap += " <requestXml><![CDATA[" + txtRequest.Text + "]]></requestXml>";

soap += " </Request>";

soap += "</soap:Body>";

soap += "</soap:Envelope>";

webRequest.Headers["SoapAction"] = "http://www.52taiqiu.com/Request";

//字符转字节

byte[] bytes = Encoding.UTF8.GetBytes(soap);

Stream writer = webRequest.GetRequestStream();

writer.Write(bytes, , bytes.Length);

writer.Flush();

writer.Close();

string result = "";

//返回 HttpWebResponse

try

{

HttpWebResponse hwRes = webRequest.GetResponse() as HttpWebResponse;

if (hwRes.StatusCode == System.Net.HttpStatusCode.OK)

{//是否返回成功

Stream rStream = hwRes.GetResponseStream();

//流读取

StreamReader sr = new StreamReader(rStream, Encoding.UTF8);

result = sr.ReadToEnd();

sr.Close();

rStream.Close();

}

else

{

result = "连接错误";

}

//关闭

hwRes.Close();

txtResponse.Text = result;

}

catch (System.Net.WebException ex)

{

String responseFromServer = ex.Message.ToString() + " ";

if (ex.Response != null)

{

using (WebResponse response = ex.Response)

{

Stream data = response.GetResponseStream();

using (StreamReader reader = new StreamReader(data))

{

responseFromServer += reader.ReadToEnd();

}

}

}

txtResponse.Text = responseFromServer;

}