VB.Net 2003 FORM KEYDOWN problem

**Lennie** · 12-22-2009, 07:59 AM

Hi There,
I am developing VB.NET 2003 window application having problem with the FORM KEYDOWN event.

Problem with cancelling the keydown event when the data check function return FALSE due to duplicate Debtor ID.
How to cancel the KeyDown ?

Code:

Private Sub FrmDebtor_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles MyBase.KeyDown

	If e.KeyCode = Keys.Tab Or e.KeyCode = keys.Enter Then
	        If Me.TabIndex = 1 Then
	 	If FCheckDuplicate = True Then
			e.KeyCode = Keys.Cancel
		End If
	       End If
	End If	
End sub

**Hack** · 12-22-2009, 08:24 AM

Try

Code:

e.Handled - True
'or 
e.SuppressKeyPress = True

**Lennie** · 12-22-2009, 06:10 PM

Thanks Hack,
Will try it out and if it works will post the script here to share with others.

**Lennie** · 12-22-2009, 06:43 PM

Hi Hack
To try out your suggestion, I have modified the script that I initially posted here as per samplel listed below. Surprising, the TAB key action is not working while ENTER is.

Private Sub FrmDebtor_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles MyBase.KeyDown

If e.KeyCode = Keys.Tab and ( Me.TabIndex = 1 ) Then
If FCheckDuplicate = True Then
e.handled = false
End If
End If
End sub

**Hack** · 12-23-2009, 08:37 AM

Are you sure that when you hit TAB that Me.TabIndex = 1 is true?

**Lennie** · 12-23-2009, 05:06 PM

Hi Hack,

Are you sure that when you hit TAB that Me.TabIndex = 1 is true?

Yes, it's true. Have you tried it ?

**Phil Weber** · 12-24-2009, 04:58 PM

You cannot capture the Tab key in the KeyDown (or any other) event; the control processes the Tab key before it fires the event. See if this helps: http://support.microsoft.com/kb/327821