pass variable value from one dialogbox to other/ one class to other class in vc++ MFC

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There's nothing magic about dialog boxes. You pass variables around the same way you do with any other objects. You can write set and get methods or if it's public, just set the member directly.

CMyDialog dlg;
dlg.m_intVariable = 7;

What's the confusion?

in CMyDialog1 class file:
m_intVariable =7;

and in CMyDialog2 class file:
int value;
CMyDialog1 dlg;
value= dlg.m_intVariable ;

if we do not call DoModal method before assignment then dlg.m_intVariable is empty.