WPF CreateBitmapSourceFromHBitmap() memory leak

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MSDN for Bitmap.GetHbitmap() states:

Remarks

You are responsible for calling the GDI DeleteObject method to free the memory used by the GDI bitmap object.

So use the following code:

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

// your code
using (System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(1000, 1000)) 
{
    IntPtr hBitmap = bmp.GetHbitmap(); 

    try 
    {
        var source = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(hBitmap, IntPtr.Zero, Int32Rect.Empty, System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions());
    }
    finally 
    {
        DeleteObject(hBitmap);
    }
}

I also replaced your Dispose() call by an using statement.

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