Encrypt/Decrypt String in c#

In .net you can easily encrypt/decrypt string.
The following code describes how to do:

    /// <summary>

    /// To encrypt the input password

    /// </summary>

    /// <param name="txtPassword"></param>

    /// <returns>It returns encrypted code</returns>

    public string EncryptPassword(string txtString)

    {

        byte[] passBytes = System.Text.Encoding.Unicode.GetBytes(txtString);

        string encryptPassword = Convert.ToBase64String(passBytes);

        return encryptPassword;

    }

    /// <summary>

    /// To Decrypt password

    /// </summary>

    /// <param name="encryptedPassword"></param>

    /// <returns>It returns plain password</returns>

    public string DecryptPassword(string encryptedString)

    {

        byte[] passByteData = Convert.FromBase64String(encryptedString);

        string originalPassword = System.Text.Encoding.Unicode.GetString(passByteData);

        return originalPassword;

    }

You can do it in another way:

        /// <summary>

    ///

    /// </summary>

    /// <param name="password"></param>

    /// <returns>It returns encyped string</returns>

    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;

    }

    /// <summary>

    ///

    /// </summary>

    /// <param name="encryptpwd"></param>

    /// <returns>It returns text string</returns>

    public string Decryptdata(string encryptpwd)

    {

        string decryptpwd = string.Empty;

        UTF8Encoding encodepwd = new UTF8Encoding();

        System.Text.Decoder utf8Decode = encodepwd.GetDecoder();

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

        int charCount = utf8Decode.GetCharCount(todecode_byte, 0, todecode_byte.Length);

        char[] decoded_char = new char[charCount];

        utf8Decode.GetChars(todecode_byte, 0, todecode_byte.Length, decoded_char, 0);

        decryptpwd = new String(decoded_char);

        return decryptpwd;

    }