Explain dialog data exchange (DDX) and dialog data validation (DDV)

dialog data exchange (DDX) In MFC , a method for transferring data between the controls of a dialog box and their associated variables. DDX is an easy way to initialize dialog box controls and gather user data input.

dialog data validation (DDV) In MFC , a method for checking data as it is transferred from the controls in a dialog box. DDV is an easy way to validate data entry in a dialog box.

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