public static string StreamToString(Stream stream)

        {

            stream.Position = 0;

            using (StreamReader stremReader = new StreamReader(stream, Encoding.UTF8))

            {

                return stremReader.ReadToEnd();

            }

        }

        public static Stream StringToStream(string str)

        {

            byte[] strBytes = Encoding.UTF8.GetBytes(str);

            return new MemoryStream(strBytes);

        }