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

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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.

please give me simple solution for this.

I did not get that class example