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Returns the IWorksheets collection that represents all worksheets in the workbook.
This property returns the workbook-level worksheets collection. The property has a read-only getter; use the returned collection to access worksheets by index or name, and to manage worksheets in the workbook.
IWorksheets Worksheets { get; }
ReadOnly Property Worksheets As IWorksheets
worksheet.Name = "Summary";
IWorksheets sheets = workbook.Worksheets;
IWorksheet firstSheet = sheets[0];
IWorksheet summarySheet = sheets["Summary"];