Validation in 3 tier windows application

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I want to perform validation for user input in 3 tier c# windows application.
Where is the exact place to place the validation code (i.e. in presentation layer or BAL) and display appropriate massage related to it.

Eg:

if()
{
//errormessage..............
}
else
{
//ok......................
}

Please suggest solution along with sample code

What I have tried:

if()
{
//errormessage..............
}
else
{
//ok......................
}

Posted 29-Feb-16 17:11pm

jayesh_n

Updated 29-Feb-16 17:35pm

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vipan.net 1-Mar-16 0:19am

Best way of implementing validation in presentation layer. and which type of example you are looking ( like: required) . if you explain, i will provide you .

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PeerMohamedMydeen · Answer 1 · 2016-02-29T17:35:00

Hi Jayesh,

What are the validations you want to perform ?

Input validation may or may not require a metadata to validate. In case your validations require metadata to validate, then you might want to keep your validation in Business Layer as the validations are also part of your business.

If your input validations is a simple Non-empty / Range / Valid characters, then probably you can keep the validations part of Presentation layer.

Thanks !