By default, there is no validator server control available to validate the validity of checkbox in ASP.NET. On the basis practice, I have to use CustomValidator control or using pure client-side JS or the postback checking on server-side. But to ease the job, you can try Custom Checkbox Validator, created by Microsoft MVP, Scott Mitchell.
URL : http://aspnet.4guysfromrolla.com/articles/092006-1.aspx
IsValid? True !
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Here is the fully functional control free to download..
Hope this helps..Tested on IE and FF
http://znetcontrols.blogspot.com/2008/08/required-field-validator-for.html
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