When you create a workbook programmatically, it is a native Microsoft.Office.Interop.Excel.Workbook object, not a Microsoft.Office.Tools.Excel.Workbook host item.
Applies to: The information in this topic applies to document-level projects and application-level projects for Excel 2007 and Excel 2010. For more information, see Features Available by Office Application and Project Type.
You can generate a Microsoft.Office.Tools.Excel.Workbook host item for a Microsoft.Office.Interop.Excel.Workbook object in an application-level project. For more information, see Extending Word Documents and Excel Workbooks in Application-Level Add-ins at Run Time.
To create a new workbook
Use the Add method of the Workbooks collection.
Visual BasicDim newWorkbook As Excel.Workbook = Me.Application.Workbooks.Add()
C#Excel.Workbook newWorkbook = this.Application.Workbooks.Add(missing);
NoteYou can create a workbook based on a template other than the default template: pass the template you want to use as a parameter to the Add method.