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I have a model, EventSearch defined and I’m stumped on how to create a validator that will require at least one field to be filled for the model to be considered valid. It seems to me this will either be a model annotation or I could annotate each property as belonging to a group of “Require At Least One”. Anybody run into this before?
Check out these links on how to create custom data annotations by extending from the ValidationAttribute class:
Custom model validation of dependent properties using Data Annotations
Custom Validation Attribute MVC2