When you create a document programmatically, the new document is a native Document object. This object does not have the additional events and data binding capabilities of a Document host item. For more information, see Programmatic limitations of host items and host controls.
Applies to: The information in this topic applies to document-level projects and VSTO Add-in projects for Word. For more information, see Features available by Office application and project type.
When you develop a document-level project, you cannot programmatically add Document host items to your project. In a VSTO Add-in project, you can convert any Document object to a Document host item at run time. For more information, see Extend Word documents and Excel workbooks in VSTO Add-ins at run time.
To create a new document based on the Normal template
The Add method has an optional Template argument to create a new document based on a template other than the Normal template. You must supply the file name and fully qualified path of the template.
To create a new document based on a custom template