http://www.c-sharpcorner.com/UploadFile/pseabury/JavaLikeStringTokenizer11232005015829AM/JavaLikeStringTokenizer.aspx
http://topic.csdn.net/t/20020704/06/848464.html
http://stackoverflow.com/questions/70405/does-c-sharp-have-a-string-tokenizer-like-javas