static void Test1()
{
String[,] s1 = { { "this", "is" }, { "a", "test" } };
IEnumerator en = s1.GetEnumerator();
Console.WriteLine(en.MoveNext());
Console.WriteLine(en.Current); //this
Console.WriteLine(en.MoveNext());
Console.WriteLine(en.Current); //is
Console.WriteLine(en.MoveNext());
Console.WriteLine(en.Current); //a
Console.WriteLine(en.MoveNext());
Console.WriteLine(en.Current); //test
Console.WriteLine(en.MoveNext());
}