thanks pasztorpisti, will try that.

Yes ,it is inherited from CCmdTarget(base class of all classes used) M still stuck to that error @pasztorpisti-How to pass multiple parameters to a button event handler.

Thanks, Yes Have inculded the header file.

error C2440: 'static_cast' : cannot convert from 'void (__thiscall COptionDBTransport::* )(PCTSTR)' to 'AFX_PMSG'

Throws error at this line-

ON_BN_CLICKED(IDC_BUTTON_udpCheck, &COptionDBTransport::OnBnClickedButtonudpcheck)

Please help me for this issue.