How do I validate a custome property value in a custom class?

[batvink]

Firstly, so you understand my level of knowledge - I'm a seasoned programmer (mainframe styley), but VB is a hobby, and one that I don't get too much exposure to.

PropertyGridEx is a nice little extension of the standard Property Grid. It allows you to take any value (variable, property or control) and assign it to a Property Grid value. Essentially this means that the user can enter a value and the property value (in my example) gets updated automatically.

But - the Property grid allows you to type an alpha value into a text box (naturally) even though the attached property is a double. So somewhere in between the text being entered and it reaching the property which is incompatible, I need to catch the error. Unfortunately it seems to be in no-mans land, and I can't intercept it. You can see the result of adding an "x" to a similar, integer property in the image below (I hope it shows up).

I'm hoping there is a standard method for dealing with this situation.

[FourBlades]

I don't think you can. Like you said the PropertyGrid is catching it before your property.
You'd have to dig into the code for the p.g. class and see if you can copy it's behavior.
Other than that, you're out of luck because your base class is where the problem is.