Enforcing Authentication using the Windows IdP

Overview: SharePoint farms often have multiple Identity Providers (IdP) such as Ping or SiteMinder and you always need to have Windows for the Search and other reasons.  Often you need to force the browser or CSOM code to use a specific IdP, in my case, the Windows IdP needs to be used.

In Fiddler, I have added a header as shown below to enforce the browser uses the Windows IdP:

CSOM HTTP Header added to force usage of the Windows IdP:

Simple Code for a CSOM SharePoint Test Rig