[RESOLVED] Prevent developer from placing a UserControl more than one time in Design Time

[FunkyDexter]

I don't know of a way to cancel the control creation

Haven't got an ide in front of me to check but you could presumably just remove it:-

f.Controls.Remove(Me)

By the way, I think there's a typo in your code:-

Dim c = f

Should be:-

Dim c = f.GetNextControl(c, True)

Unless you actually want to check the control isn't the form for some reason


edit> crossed over

You may or may not want this:-

If Me.DesignMode

While that's in they could add a second control to the form at run time.

is the same thing?

Not quite. The "On" methods fire the events and are the intended method for firing the event from code, rather than calling the handling event directly. The correct way to wire up an event handler is the first one.