Question

Assuming you have a class Photo:

class Photo {   public string Title {get; set;}   public string FileExtension {get; set;}   public void Save()    {      // Save to backing store here    } } 

Which would be the best place to check whether the values have been set correctly. In the propert setter or the Save method.

Edit: What if it is an Update method? If photos are added through a PhotoManager, using a method like PhotoManager.Add(Photo p), then which is the best place to do the validation.

Kind regards,

Answer 1

Don’t let your instances fall into an invalid state: validate right in the setter, that’s what it’s there for.