How do I validate as required a checkboxlist in asp.net?

Well, Dude, there isn't an "out of the box" validator for the checkboxlist control, mostly because the way it renders to the client - as a list.

So, you're going to need to look at a custom validator to handle this for you:

Check out the following article for one approach to solving the problem:
http://dotnetjunkies.com/Tutorial/ECCCD6...

It takes a little while to set up, but I've gone through it and have found it to be a fairly easy implementation and use it on a couple of my production sites.

I hope this helps you out!

Take care,
Ric

nice, thanks for that.
I tried with a customvalidator, but that couldn't be attached to the checkboxlist either, so I made a temp solution just attaching it to another control, that had to be required as well and then validating the checkboxlist with an OnServerValidate-method.
It's a hack, but it works right now.
But this solution looks better and thas the client side as well.

Or you can use this free control:

http://www.aboutfortunate.com/Component-...