Question

I use Asp.net 4 in C# and Entity Framework 4.

My web application is layerered in this way:

• Data Access Layer using EF.
• Business Logic Layer using Class.
• User View Layer using Web Forms and ObjectDataSource to call BL.

At the moment for Validation I use MS Validation Control son every single Web Form so I can have Client and Server validation.

The main disadvantage for this approach is that I have to insert different Validation Control repeatedly on every Web Form with consequent nightmare in maintaining.

My questions:

• Do you know a better pattern where I can centralize my Validation Roles and make it work on both Client and Server side?
• Where would you advice me to insert the logic for Validation? Inside the Business Logic Layer?
• Can EF POCO help to accomplish this?
• What about System.ComponentModel.DataAnnotations have you ever used it, What are your thoughts?

Please give me your opinion and some resource if you have any. Thanks for your help!

Answer 1

We use the Validation Application Block from Microsoft;

http://msdn.microsoft.com/en-us/library/ff664356(v=PandP.50).aspx