一些正则的例子:
http://topic.csdn.net/u/20091127/13/736a9bbd-d75c-4760-8e5a-d9d646adf998.html
http://topic.csdn.net/u/20091127/15/c3767254-a796-4813-babf-ebb2e0227db8.html
http://topic.csdn.net/u/20091127/13/736a9bbd-d75c-4760-8e5a-d9d646adf998.html
http://topic.csdn.net/u/20091127/15/c3767254-a796-4813-babf-ebb2e0227db8.html
text_change(sender, e)
{
try
{
int.Parse(textbox.Text)
}
catch
{
textbox.Text.Clear();
}
}