Cancel = false AND will disable the validation and allow you to close the form of all the controls validating events.
Now we will add code in our sample to validate the complete form when the “Create Appointment” button is clicked.
When the Text Box loses its focus the value would be validated and the Combo Box would be populate the appropriate values retrieved from the database.
Of course, there was lots of more cool features involved but for the sake of this post I'll keep it simple.
However this is a far more serious issue than has been portrayed in the press, with considerable implications for user safety., so sharing any sensitive information might be a bad idea anyway.