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I have created a dialog box in my Win Forms application. When the user clicks ok, I only want the dialog box to close if all entries are valid.I can see how to do this with the "Validating" events for each control separately. But these only seem to fire when a control loses focus. though: The Error Provider component does not provide built-in support for accessibility clients.To make your application accessible when using this component, you must provide an additional, accessible feedback mechanism.This behavior was achieved by dragging an Error Provider component onto the dialog and handling the Validating event like so: Notice the call to Error Provider.Set Error, passing in the control the error is associated with (which we get from the sender argument to the Validating event), along with the error string, which will be used as the tool tip.

Active Control property to the current form, focus events occur in the following order Enter Got Focus Leave Validating Validated Lost Focus When you change the focus by using the mouse or by calling the Focus method, focus events occur in the following order: Enter Got Focus Lost Focus Leave Validating Validated event provides the hook to perform the validation and Error Provider gives a nice consistent approach to providing the user with feedback on any error conditions.

Does any one know of where I can some details on this?

ETA: I added a handle to the Validated event as well.

Despite the fact that the data source is updated, if you do set Cancel in the validating event, the Validated event will not be fired, so you can still prevent the user from progressing.

I have a Tab Control with multiple Tab Pages which each contain multiple controls.

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