I have a form with a textbox on it.  The textbox will contain a user
entered id number.  Since I want the ID number to be unique, I have added a
validating event handler to check that the user id entered is not already
in the collection.  If it is, I indicate an error to the user and set the
cancel property of the validating event to True so the user will enter the
id again.

I also have a cancel button on the form.  If the user has entered an
incorrect value in the textbox and then clicks cancel, I don't care about
the validation.  

But, when the user clicks the button, it still indicates that the entered
user ID is invalid.  I want, that if they click cancel, to ignore the
validation of the textbox.  To do this, I set the CausesValidation propert
of the *cancel button* to false, thinking that when clicked the form would
not be validated, but it has not worked.

Any suggestions?