how to encrypt and decrypt password in asp.net

        public string Encryptdata(string password)

        {

            string strmsg = string.Empty;

            byte[] encode = new byte[password.Length];

            encode = Encoding.UTF8.GetBytes(password);

            strmsg = Convert.ToBase64String(encode);

            return strmsg;

        }

        public string Decryptdata(string encryptpwd)

        {

            string decryptpwd = string.Empty;

            UTF8Encoding encodepwd = new UTF8Encoding();

            Decoder Decode = encodepwd.GetDecoder();

            byte[] todecode_byte = Convert.FromBase64String(encryptpwd);

            int charCount = Decode.GetCharCount(todecode_byte, 0, todecode_byte.Length);

            char[] decoded_char = new char[charCount];

            Decode.GetChars(todecode_byte, 0, todecode_byte.Length, decoded_char, 0);

            decryptpwd = new String(decoded_char);

            return decryptpwd;

        }