Clip Region problem

I"m trying to restore the previous clip region after modifying it to draw.  What I'm doing is crashing for some unknown reason.
Any suggestions or improvements? 
THANKS!
Todd.


void drawing(CDC odc) // parameter set by caller hdc in window
{
  CRect r(1,1,10,10);    // Example rectangle to remove from drawing
  
  CRgn m_PrevRgn;       // PROBLEM? trying to restore previous RGN
  odc.GetClipRgn(m_PrevRgn);   // Read it, then restore it.

  odc.ExcludeClipRect(r);

  //... drawing code
  //... 

  odc.SelectClipRgn(m_PrevRgn,RGN_COPY);  // RESTORE

  odc.Detach();   // caller's DC
}



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