The Disconnected Service Agent Application Block

Provides management features for executing Web services from occasionally connected smart client applications.
Application can maintain a queue of Web service requests when offline (disconnected) and then replay them when a connection to the server application becomes available.

RequestManager
class manages the request queues and uses the services of the RequestDispatcher class to dispatch these requests. stores the queues of pending and failed requests in a SQL Server 2005 Compact Edition database. It takes the messages from the queue and dispatches them when the application is online. Requests remain in the database until successful submission to the remote server or until the request expires.

Request
class is the store for a Web service request, including the arguments or parameters required by the Web service method.

ConnectionMonitorAdapter
class provides information about the connection used by the request, such as the price and network details, and it raises events when status of the connection changes.

EndpointCatalog
class that contains the endpoints to use for the request. Requests to a remote service require details of the endpoint, such as the network type, credentials, and URL.

OfflineBehavior
class exposes properties that provide information about the request, such as the date and time it was queued. You also use this class to specify features of the request, such as the expiration, maximum number of retries, the number of "stamps", and the Tag value.