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If you write your own code to instantiate objects, you are responsible for disposing of them as well. Every object inherits a Destroy method (called a destructor) from TObject. To destroy an object, however, you should call the Free method (also inherited from TObject), because Free checks for a nil reference before calling Destroy.
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There also "Exit" command available. you can use Abort stop any operation(s).
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OnCalculate is event in Delphi it trigerrs when you are reading data from the database .It trigerrs on reading each row
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