JSON using JavaScriptSerializer in C#

I had to work with JSON recently to integrate the Payeezy gateway to our website. First time I used the dynamic type in C#. Below is the code I used to create the JSON:



 dynamic payload = new
        {
            merchant_ref = "Payeezy Token test",
            transaction_type = "purchase",
            method = "token",
            amount = amt,
            currency_code = "USD",
            token = new
            {
                token_type = "FDToken",
                token_data = new
                {
                    type = cardType,
                    value = transarmorTokenValue,
                    cardholder_name = cardHolder,
                    exp_date = expMonth+expYear
                }
            }
        };
        jsonString = JSONHelper.ToJSON(payload);



In order to parse the response JSON:

StreamReader responseStream = new StreamReader(webResponse.GetResponseStream());
responseString = responseStream.ReadToEnd();
 var responseValues = JSONHelper.ToDictionaryStringObject(responseString);
  int bankResponse = Convert.ToInt32(responseValues["bank_resp_code"]);



    
The JSONHelper class:

public static class JSONHelper
{
    public static string ToJSON(this object obj)
    {
        JavaScriptSerializer serializer = new JavaScriptSerializer();
        return serializer.Serialize(obj);
    }


  public Dictionary<string, object> ToDictionaryStringObject(string s)
{
       var json = new JavaScriptSerializer();
       return json.Deserialize<Dictionary<string, object>>(s);
}

}