A workbook is a document in the ASPxSpreadsheet control. It is an object that exposes the IWorkbook interface.
The IWorkbook interface provides a comprehensive set of properties and methods required to manipulate the corresponding workbook. To access a workbook that is currently loaded in the ASPxSpreadsheet control, use the ASPxSpreadsheet.Document property. This is the starting point for using the ASPxSpreadsheet API.
By default, when you create an ASPxSpreadsheet instance, it contains a workbook with one empty worksheet ("Sheet1"). The same workbook is also created when you call the IWorkbook.CreateNewDocument method. To load an existing document into the ASPxSpreadsheet control, use the IWorkbook.LoadDocument method. To save a workbook after all modifications are complete, use the IWorkbook.SaveDocument method. The Supported Formats topic lists the file formats supported for loading and saving workbooks.