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what is DoDataExchange(DDx) and what its use in MFC

DoDataExchange is used to exchange valid dialog  data .its called by the framework.
syntax look like as:-

void CMyClassDlg::DoDataExchange(CDataExchange* pDX)
{
   CDialog::DoDataExchange(pDX);
   DDX_Text(pDX, IDC_CONTROLID, VARIABLENAME);
 DDV_MinMaxInt(pDX, variableName, 1, 20);
}

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