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However you can in my opinion for ever do (not tested) sub Button Click event textbox1_validating(textbox1,nothing) textbox2_validating(textbox2,nothing) etc.end sub As alternative for the already supplied options, while not knowing what actions you take because of validationg errors.Figure 1: Example use of the Error Provider component When the user attempts to chance focus out of the empty text box, we use an instance of the Error Provider component to set an error associated with that text box, causing the icon to be displayed to the right of the text box and making the tool tip available if they need more info.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.

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If something is wrong in user input I show a warning message. Cancel=true] to method the message is displayed twice (event fired twice). Thanks Mona [Grape City] Hello to all I'm handling the Validating event for one text box. If something is wrong in user input I show a warning message. Cancel=true] to method the message is displayed twice (event fired twice).

However, sometimes you need to validate more free form data entry, like what a user types into a text box.

List boxes, radio buttons and all of the other controls that give users choices all do so to make sure that the provide data in the correct format.

Is there anything in WPF I can use to get the same result, an event raised only after the user is done changing the text?

This article was originally published in the "Chris Sells on . I don't mean don't trust them to pay (which is a completely separate issue that I won't go into here). For that, you need to handle a control's Validating event: The Validating will be called when moving focus from a control on the dialog that has the Causes Validation property set to true to another control that has the Causes Validation property set to true, e.g. The Validating event gives the handler the chance to cancel the move of focus by setting the Cancel Event Args. In this example, if the user doesn't enter a name into the text box, than the Validating event handler notifies the user of their transgression and cancels the event, which will keep the focus on the text box with invalid data.