Make a byte64 String from an UTF-8 String in AX2012

ToBase64String

public class Example
{
    public void main()
    {
        byte[] bytes = Encoding.UTF8.GetBytes("AX2012R3CU9");
        string base64 = Convert.ToBase64String(bytes);
        Console.WriteLine(base64);
    }
}

// Output:	 	 
// QVgyMDEyUjNDVTk=