如何将CDATA参数包含到C# soap调用中

using System;
using System.Net;
using System.IO;
using System.Text;

class Program
{
    static void Main()
    {
        // 创建SOAP请求
        HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://example.com/soap/service");

        // 设置请求方法为POST
        request.Method = "POST";
        
        // 设置SOAPAction
        request.Headers.Add("SOAPAction", "http://example.com/soap/action");

        // 设置请求内容类型为text/xml
        request.ContentType = "text/xml;charset=UTF-8";

        // 构建SOAP请求数据，包含CDATA参数
        string soapRequestData = @"<?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>
                    <MethodName>
                        <param><![CDATA[Your CDATA parameter]]></param>
                    </MethodName>
                </soap:Body>
            </soap:Envelope>";

        // 将SOAP请求数据转换为字节数组
        byte[] requestData = Encoding.UTF8.GetBytes(soapRequestData);

        // 设置请求内容长度
        request.ContentLength = requestData.Length;

        // 发送SOAP请求数据
        using (Stream requestStream = request.GetRequestStream())
        {
            requestStream.Write(requestData, 0, requestData.Length);
        }

        // 获取SOAP服务的响应
        using (WebResponse response = request.GetResponse())
        {
            // 处理响应
            using (Stream responseStream = response.GetResponseStream())
            {
                StreamReader reader = new StreamReader(responseStream, Encoding.UTF8);
                string soapResponseData = reader.ReadToEnd();
                Console.WriteLine(soapResponseData);
            }
        }
    }
}