DrawingSurface eexception on window close

[CarloAndreoli]

C#, .Net8.0, WPF application.

I have a window A which open a new window B. Window B display and correctly work using DrawingSurface. When I try to close window B, from window A or directly from the close button of window B, I get an error.

Error occur in DrawingSurface method EndD3D() because the _deviceContext is null.

Sample here:
I cant provide the whole code but this sample perfectly repoduce the problem. Run the application, click on open button then close the secondary window.
VorticeTest.zip

ps thanks for your work

[h1cks]

I suggest you create an unattached context you render to and bitmap copy across to each window. Rather than directly linking to the window directly in dx. That was the approach I have used on MDI