Hi

We can automation Excel.
The code line below will create two new workbooks.

Excel.Application exApp = new Excel.ApplicationClass();
exApp.Visible = true;
exApp.Workbooks.Add(Missing.Value);
exApp.Workbooks.Add(Missing.Value);

Here is a KB article about how to automation Excel in C# for your reference.
302084 How To Automate Microsoft Excel from Microsoft Visual C# .NET
http://support.microsoft.com/?id=302084

Best regards,

Peter Huang
Microsoft Online Partner Support

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