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2012-04-15T10:58:33.543
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2012-04-15T10:58:33.543
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The problems you're experiencing are a result of not reading the documentation carefully. The docs for the <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.control.lostfocus.aspx" rel="nofollow"><code>LostFocus</code> event</a> make very clear that you should not attempt to set the focus (e.g., by calling the <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.control.focus.aspx" rel="nofollow"><code>Focus</code> method</a>) in the handler method for this event: <blockquote> Caution Do not attempt to set focus from within the Enter, GotFocus, Leave, LostFocus, Validating, or Validated event handlers. Doing so can cause your application or the operating system to stop responding. For more information, see the <code>WM_KILLFOCUS</code> topic in the "Keyboard Input Reference" section, and the "Message Deadlocks" section of the "About Messages and Message Queues" topic in the MSDN library at <a href="http://msdn.microsoft.com/library" rel="nofollow">http://msdn.microsoft.com/library</a>. </blockquote> A better solution is to handle the <a href="http://msdn.microsoft.com/en-us/library/system.windows.forms.control.validating.aspx" rel="nofollow"><code>Validating</code> event</a>. You'll perform your input validating inside the <code>Validating</code> event handler method, which is raised automatically by the .NET Framework. If the input is valid, you do nothing. If the input is not valid, you set the <code>Cancel</code> property of the <code>CancelEventArgs</code> parameter to <code>true</code>, causing all of the downstream events to be suppressed. <pre><code>Private Sub myTextBox_Validating(ByVal sender As Object, _ ByVal e As ComponentModel.CancelEventArgs) _ Handles myTextBox.Validating If Not Valid(myTextBox.Text) Then ' Validation failed, so cancel the event and pre-select the text. e.Cancel = True myTextBox.Select(0, myTextBox.Text.Length) ' Optionally (but recommended): Set an ErrorProvider control. ' errorProvider.SetError(myTextBox, "Invalid input") End If End Sub </code></pre>
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1. POVB form validation issue
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1. USCody Gray
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1. COIt works fine but User can not exit until valid information. I want, that user may leave/exit the form, may he/she inputed wrong text
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2. CO@Shah That, too, is covered in the linked documentation. Set the `CausesValidation` property of your "Exit" button (and any other controls you wish) to `true` so that clicking it does not raise the `Validating` or `Validated` events.
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