How to close Excel automation object

Hi Experts,
I use D7 to write an application to read a Excel file and extract some content and insert into SQL database. Everything is fine but I don't know how to end the Excel in the application. I examine with task manager and find several 'EXCEL.EXE'.

I use the follow statement to create the oleobject
  if opendialog.Execute then begin
       xlsfile :=opendialog.FileName;
       myexcel := createoleobject('excel.application');;

Then how do I close/free the object?

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myexcel := unassigned;

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