Modifying Order

HttpWebRequest req = WebRequest.Create(new Uri("https://api.kite.trade/orders/regular/" + orderId.ToString())) as HttpWebRequest;
req.Method = "PUT";
req.ContentType = "application/json";

req.ContentLength = data.Length;

using (var streamWriter =new StreamWriter(req.GetRequestStream()))
{
streamWriter.Write(data.ToString());
}
string result = null;
using (HttpWebResponse resp = req.GetResponse() as HttpWebResponse)
{
StreamReader reader = new StreamReader(resp.GetResponseStream());
result = reader.ReadToEnd();
}

StringBuilder valuesSendToZerodha = new StringBuilder();
valuesSendToZerodha.Append("api_key=" + Api_Key);
valuesSendToZerodha.Append("&access_token=" + AcessToken);
valuesSendToZerodha.Append("&tradingsymbol=" + tradingsymbol);
valuesSendToZerodha.Append("&transaction_type=" + transaction_type);
valuesSendToZerodha.Append("&order_type=" + order_type);
valuesSendToZerodha.Append("&product=" + product);
valuesSendToZerodha.Append("&quantity=" + quantity);
valuesSendToZerodha.Append("&price=" + price);
valuesSendToZerodha.Append("&trigger_price=" + trigger_price);
valuesSendToZerodha.Append("&exchange=" + exchange);
valuesSendToZerodha.Append("&validity=" + validity);
valuesSendToZerodha.Append("&disclosed_quantity=" + disclosed_quantity);

Not Getting any JSON response , just giving an exception as "The remote server returned an error: (500) Internal Server Error."

We have noticed that even if we pass MIS as Product while putting offsite order, it is converted to CNC on your basket order interface. Is it intentional or a flaw?