WebBrowser print settings
To control HTML printing layout beyond @media CSS with WebBrowser (both WinForms and WPF), you would need to implement your own Internet Explorer Print Template. That would provide full control over headers, margins, columns, etc.
Specifically, you're after TemplatePrinter.orientation. It isn't properly documented, but it works. The source of the standard IE print template can be viewed when navigated to res://ieframe.dll/preview.dlg.
Some other relevant resources:
- Beyond Print Preview: Print Customization for Internet Explorer 5.5
- Print Preview 2: The Continuing Adventures of Internet Explorer 5.5 Print Customization
- Print Templates, Part I
- View templates for HTML source documents
- Demystifying printing with the Microsoft WebBrowser control and ShowHTMLDialogEx
- Add support to print & preview HTML in a dialog-based MFC app
- IDM_PRINT
- IDM_PRINTPREVIEW
- MSKB: How to print custom headers and footers for a WebBrowser control in Internet Explorer