显示值不等于TextBox. text。

I check the postal code for about 60 countries. The user enters a postal code which is checked against the rules for that country. The US is an exception where I can auto-fill the value based on other street address information already entered. In some ways it's basically an auto-correction feature. The problem is the auto-filled value never re-displays if it matches the previous .Text value - the 'erroneous' zip code just entered by the user remains displayed!I check the postal code for about 60 countries.