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In a MVVM WPF application, the view model acts as the window’s Data Context: This means that that all controls inside the window will inherit its Data Context unless some parent element of a control overrides this by setting its own Data Context property.

Besides inheriting and setting the Data Context property on an element directly you can also specify a binding source using the Element Name property, used when you want to bind to some other element, or the Relative Source property.

The adorned element in this case is the Text Box control itself and you include an in the control template where you want to leave space for it.

The template above will cause the error message to be displayed in a Text Block below the Text Box.

Setting the property to this value means that the value of the source property only gets updated when you explicitly call the Binding Expression. You will typically never use this approach in an MVVM application though.

If you want to bind a view model property of a specific type to a dependency property in the view of a different type you may need to implement a custom converter class by implementing the interface and setting the Converter property of the binding to an instance of this.

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Client side validation is performed by a web browser, before input is sent to a web server.Most often, the purpose of data validation is to ensure correct user input.Validation can be defined by many different methods, and deployed in many different ways.Error Template will be displayed on the adorner layer.Elements in the adorner layer are rendered on top of the rest of the visual elements and they will not be considered when the layout system is measuring and arranging the controls on the adorned element layer.

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