"Validation" is
the process of evaluating human
input and judging it valid or
invalid. User input validation
is crucial to data integrity
and data integrity is a "life
and death" issue for most
applications.
Validation is hard to do well
especially as the application
grows and validation criteria
change.
Common failings include:
- Missing and incorrect
validity checks
- Inconsistent checking
- Failure to validate at
the right times
- Poor communication with
end-users
- Inadequate mechanisms for
correcting mistakes
"
Verification" is the DevForce
technology for validating user
input and displaying the results.
This
tutorial consists of a
video series that takes you
from an empty solution to a
full featured example. You'll
be verifying after a few clicks
and then progress through a
sequence of problem / solution
exercises that lead you into
the heart of Verification.
The early lessons are quite
easy (level 200) but about
midway we kick it up a notch
(level 300) as we drill into
the details of customization.
You are welcome to dive in
or you can simply harvest the
supporting classes from the
tutorial code and use them "as
is" in your application.
Please refer also to the extensive
Verification chapter in the
Developers' Guide. Click here
to download the C# code as
it is at the end of the tutorial
(the finished Visual Basic
version will be here shortly). |
