SPField.UsedInWebContentTypes Property
SharePoint 2010
Gets a Boolean value that indicates whether the field is implemented in any content type that is used in the site collection.
Assembly: Microsoft.SharePoint (in Microsoft.SharePoint.dll)
Available in Sandboxed Solutions: Yes
Available in SharePoint Online
Property Value
Type: System.Booleantrue if the field is implemented in any site collection content type; otherwise, false.