string s=null 和string s=new string()
问下这2个的区别是什么?
2008-10-22 16:06
2008-10-22 16:10
2008-10-22 16:12
2008-10-22 16:24
2008-10-22 16:49
2008-10-22 17:25
2008-10-22 18:49
2008-10-22 18:51

2008-10-22 18:53
2008-10-22 18:54