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Have a look at writing custom validation attributes.
http://world.episerver.com/documentation/Items/Developers-Guide/EPiServer-CMS/9/Content/Properties/Property-types/Writing-custom-attributes/
You could write your own custom validator by implementing the IValidate<T> interface
http://world.episerver.com/documentation/Items/Developers-Guide/EPiServer-CMS/9/Content/Validation/
Hello,
I am new to Episerver.
Were should I look for more information on validating editors/backendsusers inputfields.
I need to make som validation on this:http://screencast.com/t/si27US3Fr So that if the user check the checkbox the other fields in the formular must also be filled to validate.
Kind Regards
Lasse