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C # WPF BitmapSource Memory Leak?

I am developing a BlackJack program that shows a BlackJack table, maps, etc. The plan is that he will play thousands of hands one after another with an automated strategy.

I have a UserSontrol UserControl that contains an ItemsControl element associated with an ObservableCollection. This CardInHand class contains a BitmapSource named CardImage. When the instance is broken, it loads the map image from the resources using the following code:

[System.Runtime.InteropServices.DllImport("gdi32.dll")]
public static extern bool DeleteObject(IntPtr hObject);

private BitmapSource GenerateCardImage() {
        Stream TempStream = this.GetType().Assembly.GetManifestResourceStream("BlackJack.Resources.CardImages.Card_" + m_Card.ShortTitle + ".gif");
        System.Drawing.Bitmap sourceBMP = new System.Drawing.Bitmap(TempStream);
        BitmapSource tempBitmapSource = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
            sourceBMP.GetHbitmap(),
            IntPtr.Zero,
            System.Windows.Int32Rect.Empty,
            BitmapSizeOptions.FromWidthAndHeight(sourceBMP.Width, sourceBMP.Height)
        );
        TempStream.Dispose();
        DeleteObject(sourceBMP.GetHbitmap());
        return tempBitmapSource;
}

The problem is that after I go through ~ 500 rounds (~ 4,000 hands or ~ 10,000 cards), I get a GDI + error, and the application takes ~ 400 MB of RAM. This is growing rapidly and is related to the number of hands that have been played.

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Clear() . , CardInHand BitmapSource, .

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+5
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+6

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