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Each control has the following events and properties that are used to validate a form. Validation on a control is triggered when the control loses focus. Cancel Event Args] object as a parameter to the event block, which you can access this by using the in the Validating event, all events that would usually occur after the Validating event are suppressed.

Use this event to provide custom validation for any input control, such as a Text Box. In other words, the validating control will retain the focus until the user provides the correct format, even if the user clicks another control such as a button or textbox.

Then in the btn Cancel_click event, either set a module level variable like m Canceling to True and then in the validating event ... It doesn't need to be validated because the user is exiting. Length Yes, closing the form causes 'validating' to take place. Close() End Sub Private Sub Text Box1_Validating(By Val sender As Object, By Val e As System. I am going to start a new thread - calling it a bug and see what happens. Down (Down Arrow) and some how (and I never figured this one out) the next control in the tab order, regardless of the Tab Stop property, got focus. Cancel = True End If End If End Sub Hi Al, Nearly 40 years for me since my first college FORTRAN IV class! Well, one of the keys you would not see in either the keypress or keydown events is the tab key, which of course will move the focus.

Darin *** Sent via Developersdex Yes, closing the form causes 'validating' to take place. One, remove the "control Box" from the form, so the user cant close it that way. in the btn Cancel_Click event: Removehandeler Text Box1.validating, Addressof Text Box1_Validating -- Terry That doesn't work either, at least not for VB2005. -- Al Reid (who didn't mean to hijack the thread) "Terry" Well it works for me - but one thing I left out - you need to set the cancel buttons 'causes validation' to false. I reprogrammed the device to only send the CR and now the problem is solved. Validating If Not mbln Cancel Then Dim dte Date As Date Time If Date Time. Why it would stop on a textbox with tabstop property set to False - I have no idea, unless it is a behavior of the container its in. Maybe you should be using the Key Down event instead of the Key Press event. here is a line copied from the documentation: "The Key Press event is not raised by noncharacter keys; however, the noncharacter keys do raise the Key Down and Key Up events." My guess is that the gun is sending some noncharacter data to you.

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.

Thankfully Win Forms has built in mechanisms to help facilitate data validation.This event occurs when the control is finished validating.Use this event to handle any needed upkeep after successfully validating the control.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.

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