Answer Posted / prabhu.somasundaram

DDV - > Associate Single control with single variable.So
that we can define the properties for that associated variable.
DDX - > Associate Input Validation Function with Particular
variable.
for ex:
void DDV_Check(CDataExchange* dx, int DividerValue)

{
if ( DividerValue< 0)
{
AfxMessageBox("Not Valid Input for Divider");
dx->Fail();
}
}
///Calling Function

//{{AFX_DATA_MAP(CDlg)

DDV_Check(dx, m_age); // Our function

//}}AFX_DATA_MAP

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