如果您正在开发一个网站，则TextBox不会发生事件"KeyPress".在Windows应用程序中可用.

http://msdn.microsoft.com/zh-cn/library/system.web.ui.webcontrols.textbox.aspx

If you are developing a website, TextBox does not have an event ''KeyPress''. It is available in Windows applications.

http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.textbox.aspx