Access violation writing Location

See more:

MFC

Hello,

I have a piece of code as below..,

m_pMem->Create(*this);
m_pMem->SetMap(MM_ANISOTROPIC);
m_pMem->SetOrg(0, 0);
m_pMem->SetExt(m_SamplesOnWindow / SamplingFactor, SHRT_MAX);
HDC dc = *m_pMem;
colors->SelectPalette(dc); // error at this line..,

At runtime an error shows like " Access Violation Writing *address* "

The debugger shows error for variable DC like " cxx0030 : Error : Cannot be evaluated "

I am unable to find out as to why there is runtime anomality.
Any help on this regard will be much appreciated..,

Thanks in Advance..,