C# - The process cannot access the file because it is being used by another process?

If you didn't change the default value for CacheOption the file is locked by the BitmapImage object. You need to specify BitmapCacheOption.OnLoad.

Assuming you created Bitmaps from all the images in the image folder this sounds like a known problem with the Bitmap class - it keeps a file lock on the file you created it from until you call dispose. Also see this thread: . NET app locks file.

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