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How to add a new workbook into Excel without open a new Excel Application?

just like the subject, my code is following: --------------------------------- object optional = Missing.Value; this.workBook = this.excel.Workbooks.Add(optional); -------------------------------- These codes can work well, but what is the problem is that it will open a new Excel Application everytime these code works. I want the Excel to run only once, how can I do? Thanks!

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