ApiCore.CommonUtils.Md5 C# (CSharp) Метод

        public static string Md5(string str)
        {
            MD5 md5 = new MD5CryptoServiceProvider();
            byte[] retVal = md5.ComputeHash(new UTF8Encoding().GetBytes(str)); ;
            return BitConverter.ToString(retVal).Replace("-", "");
        }

        /// <summary>
        /// Build query string
        /// </summary>
        /// <returns>Ready query string</returns>
        public string BuildQuery()
        {
            StringBuilder sb = new StringBuilder("http://api.vkontakte.ru/api.php?");

            this.Add("v", "3.0");
            // sorting params
            List <KeyValuePair <string, string> > myList = new List <KeyValuePair <string, string> >(this.paramData);

            myList.Sort(
                delegate(KeyValuePair <string, string> keyfirst,
                         KeyValuePair <string, string> keylast)
            {
                return(keyfirst.Key.CompareTo(keylast.Key));
            }
                );

            StringBuilder md5sig = new StringBuilder(this.session.MemberId);

            foreach (KeyValuePair <string, string> rec in myList)
            {
                md5sig.Append(rec.Key + "=" + rec.Value);
                sb.Append(rec.Key + "=" + rec.Value + "&");
            }

            md5sig.Append(this.session.Secret);
            sb.Append("sig=" + CommonUtils.Md5(md5sig.ToString()).ToLower());
            sb.Append("&sid=" + this.session.SessionId);
            //sb.Append(
            return(sb.ToString());//this.query;
        }