LinkedResource class is one of the important classes supported in System.Net.Mail for representing embedded external resource. These external
resources are used in an email attachment or as an image in an HTML attachment.
This is derived from the AttachmentBase class of System.Net.Mail namespace.
It is mainly used for creating embedded images in email. To
create the object of LinkedResource we need the content of the embedded
resource as stream or need the path of that resource and then it is added to
the HTML part of AlternateView's LinkedResources collection.