ObjectDisposedException thrown when using the WritableBitmap

Question

I am trying to convert the rendered stream from RenderTargetBitmap to the writable bitmap. I used the below code in button click and convert the stream to bitmap. If continuously converting the bitmap means it throws an ObjectDisposedException.

Code snippet

   RenderTargetBitmap rendererShapeViewBitmap = new RenderTargetBitmap();
        InMemoryRandomAccessStream renderedStream = new InMemoryRandomAccessStream();
        await rendererShapeViewBitmap.RenderAsync(button, (int)button.Width, (int)button.Height);
        BitmapEncoder encoder = await BitmapEncoder.CreateAsync(BitmapEncoder.PngEncoderId, renderedStream);
        IBuffer pixelBuffer = await rendererShapeViewBitmap.GetPixelsAsync();
        var dataWriter = new Windows.Storage.Streams.DataWriter(renderedStream);
        int heiht = rendererShapeViewBitmap.PixelHeight;
        int width = rendererShapeViewBitmap.PixelWidth;
        encoder.SetPixelData(BitmapPixelFormat.Bgra8, BitmapAlphaMode.Premultiplied,
            (uint)rendererShapeViewBitmap.PixelWidth, (uint)rendererShapeViewBitmap.PixelHeight, 96, 96, pixelBuffer.ToArray());
        await encoder.FlushAsync();

        var bitmap1 = new WriteableBitmap(width, heiht);
        bitmap1.SetSource(renderedStream);

        var bitmap2 = new WriteableBitmap(width,heiht);
        bitmap2.SetSource(renderedStream);