C#编写的Backspace键的代码,无错误显示,但运行时没有反应
											    string number = this.Txtread.Text;if (number.Length > 0)
{
number.Remove(number.Length - 1);
 2011-03-25 16:06
	    2011-03-25 16:06
   2011-03-25 16:40
	    2011-03-25 16:40
   2011-03-25 16:49
	    2011-03-25 16:49
   2011-03-25 17:07
	    2011-03-25 17:07
   2011-03-25 18:04
	    2011-03-25 18:04
   2011-03-25 18:17
	    2011-03-25 18:17
   2011-03-29 00:05
	    2011-03-29 00:05