How to: Programmatically Select Worksheets
The Select method selects the specified object, which moves the user's selection to the new object. Use the Activate method if you want to bring focus to the object without changing the user's selection.
Applies to: The information in this topic applies to document-level projects and application-level projects for Excel 2013 and Excel 2010. For more information, see Features Available by Office Application and Project Type.
If you want to select an existing worksheet in an application-level add-in or if the worksheet was created at run time in a document-level customization, you must access it by using the Excel Sheets collection of the Excel workbook; otherwise, you can access the Microsoft.Office.Tools.Excel.Worksheet host item directly.
Access the worksheet by using the Excel Sheets collection.