BOOL GetModify() const;
Determines if the contents of an edit control have been modified.
Windows maintains an internal flag indicating whether the contents of the edit control have been changed. This flag is cleared when the edit control is first created, and may also be cleared by calling the SetModify member function.
TRUE if the edit-control contents have been modified; FALSE if they have remained unchanged.
CEdit::SetModify, EM_GETMODIFY