With RadControls for ASP.NET AJAX Q3 2008 we introduced our brand new component called RadInputManager. You can find more info about this unique control on following articles:
Introducing the RadInputManager control for ASP.NET AJAX
Using Regular Expression TextBox
RadInputManager First Look
I've made small demo to check how the input manager will perform compared to standard validation approach in ASP.NET and here is the result:
- RadInputManager: 200 standard TextBox controls with skins (hover, focus, empty, negative, enabled/disabled, read-only & invalid styles), in-place validation and formatting and many more.
[RadInputManager | Standard Validation | Download]