VC++ 2008 Error Map/set iterator is incompatible

I have a project well running on VC++ 2003 .Net. But I have upgraded it to VC++ 2008 then it is compiled successfully. Now, I executed it & it crashes in the following code:

CString szDCode(_T("E007"), _T("****"));
map<CString, CString>::iterator itr;
itr = m_ECodes.find(szDCode);
if(itr != m_ECodes.end())
{   
  szDCode = (*itr).second;
  itr = m_LineComponents.find(szDCode);
  if(i开发者_运维技巧tr != m_ECodes.end()) // This line is creating Error, While I have 4-5 items in it.
    szDCode = (*itr).second;
}

Here the Error being generated is: Expression: map/set iterators incompatible.

Plz help me.

Abhishek

You get an iterator from the m_LineComponents container:

itr = m_LineComponents.find(szDCode); 

You try to compare this iterator against an iterator from the m_ECodes container:

itr != m_ECodes.end()

You can only compare two iterators from the same container. Newer versions of Visual C++ include checks in the Standard Library that help you to find this sort of error. The code was never correct.