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Using a validation rule causes the validation to occur before the property is updated, so we can easily prevent such an occurrence and report it to the user.It does still allow the bad data into the Text Box, but that’s not necessarily a bad thing.Using IData Error Info When you first start looking into validating data in WPF you will no doubt run into validated the data after the property has been set.

I put generalized rules like this in a separate project and namespace so I can reuse them in many projects.For rules that are specific to a particular DAL or Application you can just as easily put them in those namespaces.Consuming Custom Validation Rules Now that we have an class, let’s add it to our XAML so we can put it into action.The Code Project article even links to a Project with a WPF version of Error Provider.I will be using a couple code samples from these articles.

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