SPWeb.AllUsers Property
SharePoint 2010
Gets the collection of user objects that represents all users who are either members of the site or who have browsed to the site as authenticated members of a domain group in the site.
Assembly: Microsoft.SharePoint (in Microsoft.SharePoint.dll)
Available in Sandboxed Solutions: Yes
Available in SharePoint Online
Property Value
Type: Microsoft.SharePoint.SPUserCollectionAn SPUserCollection object that represents the users.