Invoke internal field

Hvordan invoker jeg dynamisk min klasses internal fields jf nedenstående eksempel?

internal class MyClass{
    internal string
        MyField = "my text";


    public override string ToString(){
        Type type = GetType();

        FieldInfo[] fields = type.GetFields();
        for(int i=0; i<fields.Length; i++){
            FieldInfo field = fields[i];
            Console.Write("{0}={1}", field.Name, field.GetValue(this));

        }

        return sb.ToString();
    }
}