Base64 conversion

Utils.cs

        public static string ToBase64(string encode) {
            Byte[] btByteArray = null;
            System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
            btByteArray = encoding.GetBytes(encode);
            string sResult = System.Convert.ToBase64String(btByteArray, 0, btByteArray.Length);
            sResult = sResult.Replace("+", "-").Replace("/", "_");
            return sResult;
        }

        public static string FromBase64(string decode) {
            decode = decode.Replace("-", "+").Replace("_", "/");
            System.Text.UTF8Encoding encoding = new System.Text.UTF8Encoding();
            return encoding.GetString(Convert.FromBase64String(decode));
        }