Returns a Worksheets collection which provides access to all worksheets in the specified workbook, including charts displayed as sheets.

 public Worksheets Worksheets{ get; }
Public ReadOnly Property Worksheets() As Worksheets

Use the Worksheets object to manage the worksheets in a workbook.
ExcelWriter may not be able to parse some worksheets (such as macro sheets).

Worksheets wkshts = wb.Worksheets;
Dim wkshts As Worksheets = wb.Worksheets