C#

/// <summary><br />
/// Convert To Base64<br />
/// </summary><br />
/// <param name="text">clean text</param><br />
/// <param name="type">1(Unicode) 2(ASCII) 3(UTF7) 4(UTF8)</param><br />
/// <returns>Base64 string</returns><br />
public static string ToB64(string text, Int16 type)<br />
{<br />
        string rez = null;<br />
        switch (type)<br />
	{<br />
		case 1: //Unicode<br />
		rez = Convert.ToBase64String(Encoding.Unicode.GetBytes(text));<br />
		break;<br />
		case 2: //ASCII<br />
		rez = Convert.ToBase64String(Encoding.ASCII.GetBytes(text));<br />
		break;<br />
		ase 3: //UTF7<br />
		rez = Convert.ToBase64String(Encoding.UTF7.GetBytes(text));<br />
		break;<br />
		case 4: //UTF8<br />
		rez = Convert.ToBase64String(Encoding.UTF8.GetBytes(text));<br />
		break;<br />
	}<br />
	eturn rez;<br />
}

/// <summary><br />
/// Convert From Base64<br />
/// </summary><br />
/// <param name="text">encrypted text</param><br />
/// <param name="type">1(Unicode) 2(ASCII) 3(UTF7) 4(UTF8)</param><br />
/// <returns>clean text</returns><br />
public static string FromB64(string text, Int16 type)<br />
{<br />
	string rez = null;<br />
	switch (type)<br />
	{<br />
	case 1: //Unicode<br />
	rez = Encoding.Unicode.GetString(Convert.FromBase64String(text));<br />
	break;<br />
	case 2: //ASCII<br />
	rez = Encoding.ASCII.GetString(Convert.FromBase64String(text));<br />
	break;<br />
	case 3: //UTF7<br />
	rez = Encoding.UTF7.GetString(Convert.FromBase64String(text));<br />
	break;<br />
	case 4: //UTF8<br />
	rez = Encoding.UTF8.GetString(Convert.FromBase64String(text));<br />
	break;<br />
	}<br />
	return rez;<br />
}

using System;
using System.ComponentModel;
using System.Xml.Serialization;
using System.Security.Cryptography;
 
[Serializable]
public class UserData
{
    [XmlIgnore]
    public string Password;
 
    [XmlElement("Password", DataType = "base64Binary")]
    [EditorBrowsable(EditorBrowsableState.Never)]
    public byte[] EncryptedPassword
    {
        get
        {
            // use the classes in the System.Cryptography
            // namespace to return the encrypted password
            return YourEncryptMethod(Password);
        }
        set
        {
            // use the classes in the System.Cryptography
            // namespace to decrypt the encrypted password
            Password = YourDecryptMethod(value);
        }
    }
}