This HTML5 document contains 4 embedded RDF statements represented using HTML+Microdata notation.

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PrefixNamespace IRI
isaphttp://webisa.webdatacommons.org/prov/
n5silverlightshow.
isahttp://webisa.webdatacommons.org/
rdfhttp://www.w3.org/1999/02/22-rdf-syntax-ns#
provhttp://www.w3.org/ns/prov#
xsdhhttp://www.w3.org/2001/XMLSchema#
Subject Item
isa:385726812
rdf:type
prov:Entity
prov:value
The answer is yes: because the request to a service is made by the browser and because the browser sends along the cookies with the request, the ASP.NET authentication cookie will travel with a service request that originated in Silverlight as well.
prov:wasQuotedFrom
n5:net
Subject Item
isap:430353430
prov:wasDerivedFrom
isa:385726812