As I mentioned in a previous post, you can specify validation by creating a Validation class (or classes).
You do this by deriving a new class from the ValidationRule class and overriding the Validate method.
Why would you do this, instead of implementing IDataErrorInfo?
Well, if you wanted to do validation across a number of objects, then this is the way to go.
It also provides a level of separation from your business objects, leaving them to deal with business data and the validation objects to deal with validation.
A downside is that it is not backwardly compatible with WinForms Image may be NSFW.
Clik here to view.
How do you tell your xaml to use it? By specifying it in the ValidationRules element of your binding – just like IDataErrorInfo.
