Full Name:
How to: Save Workbooks

Short Name:
How to: Save Workbooks

Type of Entity:
C#

Abstract:
You can save a workbook using the Save method. If the workbook has not been saved before, you should call the _SaveAs method instead, so you can specify a path. Without an explicit path, Microsoft Office Excel 2003 saves the file in the current folder with the name it was given when it was created. Use the SaveCopyAs method to save without modifying the open workbook in memory.

MSDN Source URL:
http://msdn2.microsoft.com/h1e33e36.aspx