Bitmap.Save “Object is currently in use elsewhere” Threading Issue?

Indeed, you can't access an image from multiple threads simultaniously. You have to do some synchronization. If performance is a problem, you can perform the following trick.

Drawing into a bitmap and saving it in another thread is perfectly fine, as long as you don't do it at the same time. GDI+ contains a check to verify that you don't access the bitmap from more than one thread at the same time, that's why you get the exception.

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