?
Solved

validations in 3 tier application

Posted on 2012-03-19
4
Medium Priority
?
277 Views
Last Modified: 2012-03-21
Hello experts,

M developing the 3 tier application. I have one entry form and i want to put the validations for this entry form. Where do i put it? In BAL (Business access layer) or UI or somewhere else?

Please guide me.

Many thanks
0
Comment
Question by:dotsandcoms
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
4 Comments
 
LVL 53

Accepted Solution

by:
Dhaest earned 1500 total points
ID: 37736534
The best method is to perform the business-validations in the BAL.

It is never wrong to perform also some validations (like required fields, numeric fields, ...) in the GUI.


http://shoutingwords.com/creating-3-tier-layered-application-using-c-sharp.html
0
 
LVL 20

Expert Comment

by:BuggyCoder
ID: 37736535
Quoting steve from http://forums.asp.net/t/1597280.aspx/1

Validation at the presentation layer makes for a better user experience.

Validation at the 'lower' levels is important because the presentation layer may not be what is modifying the data.  Maybe it's a bulk import program or maybe it's SQL Studio that is modifying the data.

The most important validation is at the database level.  Because if invalid data gets in the system, all hope is lost.   And maybe someone's job!

Read these discussions too:-
http://msforums.ph/forums/p/54654/269489.aspx
http://asp.net.bigresource.com/Architecture-Data-Validation-in-a-3-tier-application--s9sQx80X2.html
0
 
LVL 25

Expert Comment

by:Rouchie
ID: 37736663
They should really be in both shouldn't they?

Totally agree about the user experience.  In my own 3-tier app I validate in the form to ensure that dates/blank fields etc are all recognised immediately.  Then I have further validation in the BAL to ensure that database logic is being followed.  Some of this happens in stored procedures, others in the BAL layer itself.
0
 

Author Closing Comment

by:dotsandcoms
ID: 37746135
excellent solution
0

Featured Post

Free Tool: Path Explorer

An intuitive utility to help find the CSS path to UI elements on a webpage. These paths are used frequently in a variety of front-end development and QA automation tasks.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

More often than not, we developers are confronted with a need: a need to make some kind of magic happen via code. Whether it is for a client, for the boss, or for our own personal projects, the need must be satisfied. Most of the time, the Framework…
This article is for Object-Oriented Programming (OOP) beginners. An Interface contains declarations of events, indexers, methods and/or properties. Any class which implements the Interface should provide the concrete implementation for each Inter…
In this video, Percona Solution Engineer Dimitri Vanoverbeke discusses why you want to use at least three nodes in a database cluster. To discuss how Percona Consulting can help with your design and architecture needs for your database and infras…
In this video, Percona Solutions Engineer Barrett Chambers discusses some of the basic syntax differences between MySQL and MongoDB. To learn more check out our webinar on MongoDB administration for MySQL DBA: https://www.percona.com/resources/we…
Suggested Courses

770 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question