C#解析Json

public class TransportUtility
{
public static OuterClass GetTransportWeb(string actionName, string json)
{
var serverUrl = "http://42.121.253.250:800/api/yanwen";
var client = new WebClient { Encoding = Encoding.UTF8 };
client.Headers.Add("Content-Type", "Application/json; charset=utf-8");
client.Headers.Add("Provider-Name", "winit");
client.Headers.Add("Action-Name", actionName);

var jsonData = client.UploadString(serverUrl, json);
var ser = new JavaScriptSerializer();
return ser.Deserialize<OuterClass>(jsonData);
}
}

public class OuterClass
{
public bool HasError;
public string ErrorMessage;
public string Data;
}