Hi,
I tested in VB - but only the key suppression aspect. It wasn't bound to anything (and there was no specific mask set).
I guess the problem relates to the interaction between the mask formatting, binding and event handling. I doubt that it is VB specific.
I'll play a bit more if I get a chance.....

>Well, it manifests itself as erratic, not the first time around, but when the control gets the focus after e.cancel = true in a validating routine, or when focus is set programatically or when you select the control with the mouse. When you enter numeric characters it does not render what you enter. When I either "kill" the binding or comment our this routine, this erratic behaviour does not manifest itself.
>
>I've googled . I've seen other people having similar albeit not identical problems. One MS guy suggested to add a textbox and bind that and leave the maskedtextbox unbound. Thought that to be somewhat overkill.
>
>I used maskedtextbox because like the textbox in vfp it has a mask, and I'm kind of used the concept.
>
>Thanks for caring.
>
>Marc
>
>PS: you're telling me that in C# you don't have that problem right? Could it be a VB problem, but it's been around for years, is it possible that they did not correct that "feature"? I know, I know, it is possible ....
>
>
>>Sorry, didn't realize you were doing this within the TextBox class until I looked at the link - in which case I think the code should work.
>>Just checked - works for me. What unexpected behaviour are you seeing (and are you sure it's related to the override) ?
>>
>>>Thanks Viv, I will definitely give that a try. I was wondering what the difference was and why those guru's suggested that construction, (but did not dare asking :) )
>>>
>>>
>>>>Put the code directly in the KeyPress event handler rather than overriding the OnKeyPress method
>>>>(Just double click on the event in the properties window to create the stub)
>>>>
>>>>>Why, o why does this cause eratic behaviour in my (bound) maskedtextbox(es)?
>>>>>
>>>>>Is there a fatwa against maskedtexboxes that I should know of?
>>>>>
>>>>>

>>>>>    Protected Overrides Sub OnKeyPress(ByVal e As KeyPressEventArgs)
>>>>>        ' http://www.syncfusion.com/FAQ/windowsforms/faq_c94c.aspx#q1121q
>>>>>        If e.KeyChar = Chr(13) Then 'CChar(13)
>>>>>            e.Handled = True
>>>>>        Else
>>>>>            MyBase.OnKeyPress(e)
>>>>>        End If
>>>>>    End Sub
>>>>>

>>>>>
>>>>>Thanks.
>>>>>
>>>>>Marc
>>>>>
>>>>>PS : I need this so to disable the beep each time the user completes a field with the enter key.