How to: Move a Worksheet to another Location
This example demonstrates how to move a worksheet to another location in a workbook. To do this, call the Worksheet.Move method and pass the worksheet zero-based index specifying the position in the WorksheetCollection collection into which the worksheet should be moved.
// Move the first worksheet to the position of the last worksheet within the workbook.
workbook.Worksheets[0].Move(workbook.Worksheets.Count - 1);
You can also rearrange worksheets within a workbook by using methods inherited from the Sheet interface: Sheet.MoveToBeginning, Sheet.MoveBefore, Sheet.MoveAfter, and Sheet.MoveToEnd.