How to validate textarea?

If I try to use a RequiredFieldValidator control to make sure a
textarea isn't empty, I get an error similar to

Unable to find control id 'comment' referenced by the
'ControlToValidate' property of 'rvfComment'.

I'm guessing this control does not validate a textarea. What else can
I do for this besides checking its length on postback?

Thanks,
Brett

.

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