c# using the event handler WorkbookOpen

Question

I am programming an excel add-in and I want to execute certain code when a workbook is opened. This means that if they open excel and then open a workbook, the add-in will

Answer 1

Add this to InternalStartUp()

    this.Application.WorkbookOpen += new Excel.AppEvents_WorkbookOpenEventHandler(Application_WorkbookOpen);

And then this function will be called when the workbook is opened

void Application_WorkbookOpen(Excel.Workbook Wb)
{
   //Do something         
}

Also, it is hidden in the #region VSTO generated code in ThisAddIn.cs by default.