henlarsson/RequiredWithFallback-

A custom attribute for ASP.NET. Like RequiredAttribute but with the possibility to use another property or field. Inherit from RequiredAttribute.

RequiredWithFallback

A custom attribute for ASP.NET. Like RequiredAttribute but with the possibility to use another property or field. Inherit from RequiredAttribute.

Github: https://github.com/henlarsson/RequiredWithFallback