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Returns the collection of selected worksheets in the workbook.
The returned IWorksheets object represents all worksheets that are currently selected.
IWorksheets SelectedSheets { get; }
ReadOnly Property SelectedSheets As IWorksheets
IWorksheet sheet2 = workbook.Worksheets.Add();
workbook.Worksheets[new string[] { worksheet.Name, sheet2.Name }].Select();
IWorksheets selectedSheets = workbook.SelectedSheets;