Custom textbox validating user input in

Our mission is to validate the Text Box on lost focus event hence, we are going to implement the Text Box lost focus event.Inside the lost focus event we are extracting the binding expression from the Text Box control and updating the source.For example, you start off referring to the model as "Product" but then you have this: class Contact : IData Error Info And later you say "That completes our Contact model".

Finally, the binding is set to the Text Box control which is added to the Dock Panel control.The Update Source method of the binding expression will lead to firing the validation rules.This custom user control only consist of only the basic features and can easily be extended to add more rich features.The above code will only validate successfully for numeric values.Now let's implement a form which will make use of the custom requires Text Box User Control and validate against custom validation rules.

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