How to release WriteableBitmap memory?

Question

 

Perhaps someone could help with this issue. Please read the code behind:

 

 

void myapp::MainPage::Invalidate()
 {
 
	/* Get a new bitmap*/
  	m_pDIBitmap = m_pViewer->GetRenderData(FALSE);
 
 	m_pWriteableBitmap =ref new WriteableBitmap(m_pDIBitmap->GetWidth(), m_pDIBitmap->GetHeight());
  	IBuffer^ buffer = m_pWriteableBitmap->PixelBuffer;
  
  	/* Take the WinRT IBuffer interface and cast to an IUnknown */
  	IUnknown* pUnk = reinterpret_cast<IUnknown*>(buffer);
 
 	IBufferInternal* pBufferInternal = nullptr;
 
 	/* Get the undocumented interface for accessing the pixel buffer */
  	HRESULT hr = pUnk->QueryInterface(IID_IBufferInternal, 
        							   (void**)&pBufferInternal);
 
	hr = pBufferInternal->GetBuffer(&m_pWriteableBitmapBuffer);
 
 	memcpy(m_pWriteableBitmapBuffer, m_pDIBitmap->GetBuffer(),  m_pDIBitmap->GetHeight()*m_pDIBitmap->GetPitch());
 
	/* Invalidates the writeable bitmap so it updates */
	m_pWriteableBitmap->Invalidate();
 
	/* Set the <Image/> source in the xaml to our WriteableBitmap */
	Img->Source = m_pWriteableBitmap;
 }

During run these codes,  the memory consumption increments rapidly and the memory is never freed.

Does anyone has any solution or workaround for this problem? Do i miss anything?

Thanks in advance.