PD samples are not used in this service.
Documentation is available on the website.
Removed local directory dependency. Configured to use standalone service app instead of IIS.
Changed platform target.
Fixed invalid response XML problem - the invalid XML was saved as an XML response.
Removed local directory dependency. 
Changed configuration to use proper configuration option key (ResponseXmlInstance).
Corrected serialization of the request (changed the namespace from using publishdiscover to searchretrieve).
Removed local directory dependency.
Changed project dependencies.