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By default, ClassWizard supports the types of dialog data validation (DDV) shown in the following table, but you can add additional types (see MFC Technical Note 26.
| Variable type | Data validation |
| Cstring | Maximum length |
| Numeric (int, UINT, long, DWORD, float, double) | Minimum value, maximum value |
You can define the maximum length for a CString DDX variable or the minimum or maximum values for a numeric DDX variable at the time you create it.
At run time, if the value entered by the user exceeds the range you specify, the framework automatically displays a message box asking the user to reenter the value. The validation of DDX variables takes place all at once when the user clicks OK to accept the entries in the dialog box.