有谁做过微信开发吗，求助一个问题

关于菜单这块
public string GetPage(string posturl, string postData)
{
Stream outstream = null;
Stream instream = null;
StreamReader sr = null;
HttpWebResponse response = null;
HttpWebRequest request = null;
Encoding encoding = Encoding.UTF8;
byte[] data = encoding.GetBytes(postData);
// 准备请求...
try
{
// 设置参数
request = WebRequest.Create(posturl) as HttpWebRequest;
CookieContainer cookieContainer = new CookieContainer();
request.CookieContainer = cookieContainer;
request.AllowAutoRedirect = true;
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = data.Length;
outstream = request.GetRequestStream();
outstream.Write(data, 0, data.Length);
outstream.Close();
//发送请求并获取相应回应数据
response = request.GetResponse() as HttpWebResponse;
//直到request.GetResponse()程序才开始向目标网页发送Post请求
instream = response.GetResponseStream();
sr = new StreamReader(instream, encoding);
//返回结果网页（html）代码
string content = sr.ReadToEnd();
return content;
}
catch (Exception ex)
{
string err = ex.Message;
Response.Write(err);
return string.Empty;
}
}
private string GetAccessToken()
{
string tokenUrl = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=" + appId + "&secret=" + appSecret + "";
string myToken = "";
//模拟发送get请求 获取accesstoken
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(tokenUrl);
request.Method = "GET";
request.ContentType = "text/html;charset=UTF-8";
WebClient myWeb = new WebClient();
byte[] b = myWeb.DownloadData(tokenUrl);
string accesstoken = Encoding.UTF8.GetString(b);
JsonReader reader = new JsonTextReader(new StringReader(accesstoken));
while (reader.Read())
{
if (reader.TokenType == JsonToken.PropertyName
&& reader.ValueType == Type.GetType("System.String")
&& Convert.ToString(reader.Value) == "access_token")
{
reader.Read();
myToken = (string)reader.Value;
break;
}
}
return myToken;
}
刚刚做这块，菜单效果做不出来，贴上源码，希望做过的大神帮帮我