Validating data datagrid auc dating system

If the source of a two-way binding implements the interface and the Validates On Notify Data Errors property of the binding is set to true (which it is by default), the WPF 4.5 binding engine automatically monitors the Errors Changed event and calls the Get Errors method to retrieve the updated errors once the event is raised from the source object provided that the Has Errors property returns true.Below is an example of a simple service with a single method that validates a username by first querying a database to determine whether it is already in use or not and then checks the length of it and finally determines whether it contains any illegal characters by using a regular expression.The setter of a Username property of the view model is then using a private method to call the service method asynchronously using the async and await keywords – these were added to introduce a simplified approach to asynchronous programming in the .

For example, it would be useful if the Age property of the view model was constrained to only accept values between 10 and 100 and threw an exception if the value was outside of this range: interface.If the binding is setup correctly and the view model implements the interface to provide notifications when the data changes, the changes are automatically reflected in the elements in the view that are bound to it.

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