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In the above XAML code you can see that I have used the explicit Text binding.The reason for that is that I can set the validation rules collection with the instance of the Regex Validation Rule class. In this validation there is no need to call the Validate Phone() method explicitly as we have done for exception validations.Built-in support for IData Error Info provides business-object level validation that can be used in combination with validation rules.

Let's see the code behind first, then things become clearer.

If the Data Error Validation Rule is excluded from the collection of validation rules, validation errors reported by IData Error Info will be ignored.

The moment when the data is written to the underlying data source, and therefore validated, is determined by the value of a grid's Update Source Trigger property, which indicates whether the source is updated when a cell or row is ending its edit process or when a cell's content is changed.

Through a column's Display Member Binding Info property, information about a column's binding to its corresponding field in the underlying data source can be defined.

In addition, the validation rules to apply to the data as it is read from and written to the data source (e.g., Exception Validation Rule and Data Error Validation Rule) can be provided by adding the desired validation rules to the Validation Rules collection (see Example 1).

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