In first , i very very grateful your reply........but i don't know to do .......
1. You and i also try the MaskedTexbox and DataBindings, after delete the MaskedTexbox data, and entry next control, but in this time, i can't leave the MaskedTexbox, it must i entry the data.........
2. i don't know how to use Mere Mortals Framework to solve this question?

Anyone try to use MaskedTexbox and DataBindings?

thx~~~ thx~~~ thx~~~