{"name":"lily","age":23,"addr":{"city":guangzhou,"province":guangdong}}

using Newtonsoft.Json;
using Newtonsoft.Json.Linq;

 public class UserInfo
 {
  public string name;
  public int age;
  public address addr;
 }
 public class address
 {
  public string city;
  public string province;
 }

string jsonData="{\"name\":\"lily\",\"age\":23,\"addr\":{\"city\":guangzhou,\"province\":guangdong}}";
UserInfo user=(UserInfo)JsonConvert.DeserializeObject(jsonData, typeof(UserInfo));

JObject jsonObj = JObject.Parse(jsonData);
string name=jsonObj ["name"].ToString();
string age=jsonObj ["age"].ToString();
string city=((JObject )jsonObj ["addr"])["city"].ToString();
string province=((JObject )jsonObj ["addr"])["province"].ToString();

{"name":"lily","age":23,"addr":{"city":guangzhou,"province":guangdong}};

  public string GetJsonValue(JEnumerable<JToken> jToken, string key)
  {
   IEnumerator enumerator = jToken.GetEnumerator();
   while (enumerator.MoveNext())
   {
    JToken jc = (JToken)enumerator.Current;
    if (jc is JObject || ((JProperty)jc).Value is JObject)
    {
     return GetJsonValue(jc.Children(), key);
    }
    else
    {
     if (((JProperty)jc).Name == key)
     {
      return ((JProperty)jc).Value.ToString();
     }
    }
   }
   return null;
  }

string jsonData = "{\"name\":\"lily\",\"age\":23,\"addr\":{\"city\":\"guangzhou\",\"province\":\"guangdong\"}}";
JObject jsonObj = JObject.Parse(jsonData);
Response.Write(GetJsonValue(jsonObj.Children(), "province"));

string jsonData = "{\"addr\":[{\"city\":\"guangzhou\",\"province\":\"guangdong\"},{\"city\":\"guiyang\",\"province\":\"guizhou\"}]}";
JObject jsonObj = JObject.Parse(jsonData);
JArray jar = JArray.Parse(jsonObj["addr"].ToString());
JObject j = JObject.Parse(jar[0].ToString());
Response.Write(j["city"]);