What are the .NET frameworks currently available that help build business applications?

And what are their pros/cons in terms of maturity, community support, ease of development ?...

In my mind, a business application framework should provide :

* ORM integration (possibly relying on existing solutions like NHibernate, the Entity Framework...).
* a validation library.
* UI integration components (ASP .NET and/or Windows Forms and/or WPF...).

- Speaking about ORM, take a look at BlToolkit. It is easy to work with stored procedures using it.
- As for UI, there is DevExpress libraries, that contains a lot of controls for all three technologies you listed. For ASP.NET look at ASP.NET MVC if you haven't.

[DevExpress .NET Business Application Frameworks][1]

- eXpressApp Framework
- eXpress Persistent Objects




[1]:

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[CSLA.NET][1]


[1]:

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There are loads of tools. Amoung ORMs I would look at.

* ADO.NET Entity Framework
* BLToolkit
* DataObjects.Net
* NHibernate
* EntitySpaces

I am using DataObjects currently but others are also ok.

For WPF applications, I would recommend
Microsoft Composite Application Library
with Third party controls. For example,

* Telerik .
* infragistics.
* Devexpress

These three are proved to be ok. For web applications,

* Composite Web Application Block
* LiveUI.NET
* .NET RIA Services
* ASP.NET Dynamic Data
* ASP.NET MVC (if UI is not going to be complex)