PayPal.IPNMessage.Initialize C# (CSharp) Method

        private void Initialize(NameValueCollection nvc)
        {
            List<string> items = new List<string>();
            try
            {
                if (nvc.HasKeys())
                {
                    foreach (string key in nvc.Keys)
                    {
                        items.Add(string.Concat(key, "=", System.Web.HttpUtility.UrlEncode(nvc[key], ipnEncoding)));
                        nvcMap.Add(key, nvc[key]);
                    }
                    ipnRequest = string.Join("&", items.ToArray())+"&cmd=_notify-validate";
                }
            }
            catch (System.Exception ex)
            {
                logger.Error(this.GetType().Name + ": " + ex.Message, ex);
            }
        }