Source: Microsoft Support

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A WinForms application which uses many ImageList controls may leak GDI handles.

This may prevent the application from creating graphics objects and may cause the application to crash.

A System.Windows.Forms.ImageList does not destroy its native HIMAGELIST when it is Disposed. The HIMAGELIST will not be destroyed until the underlying NativeImageList is finalized.

The application can force the ImageLists to be finalized by releasing all references to them, calling GC.Collect to force them to be collected, and GC.WaitForPendingFinalizers to wait for the ImageLists to be destroyed before continuing.

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