convert string decode in int asp.net code example

Example: system.text.encoding.utf8.getbytes decode

public static string EncodeServerName(string serverName)
{
    return Convert.ToBase64String(Encoding.UTF8.GetBytes(serverName));
}

public static string DecodeServerName(string encodedServername)
{
    return Encoding.UTF8.GetString(Convert.FromBase64String(encodedServername));
}