Typical implementation for conversion between winform Bitmap and WPF BitmapSource

BitmapToBitmapSourceExtention.cs

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

public static BitmapSource ToWPFBitmap(this System.Drawing.Bitmap bitmap)
{
    var hBitmap = bitmap.GetHbitmap();

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