c# 4.0 - Guaranteed COM object release? -

I have written the following code under assumption that Excel will die with the monkey:

  Excel ExcelMonkey {Personal Stable Excel.Application xl = New Excel.Application (); Public Stable Bull Parse (string filename) {if (filename.Contains ("foo")) {var workbook = xl.Workbooks.Open (filename); Var Sheet = Workbook. Worksheets.get_item (1); // do stuff returns true; }          return false; }}  

How can I ensure that it does? Do I have to separate the workbook and sheet ?

I have to fill the Excel for the life of the program, this is a major performance improvement

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Do I need to release workbooks and sheets separately?

Yes, either the built-in Excel application will keep the object alive.

How do I ensure that it does?

This will do, but make sure that you do not use the context of the object after this.