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The first sink of the newly formed channel sink chain, or null, which indicates that this provider will not or cannot provide a connection for this endpoint.
When the IClientChannelSinkProvider.CreateSink(IChannelSender, string, object) method is called, it creates its own channel sink, forwards the IClientChannelSinkProvider.CreateSink(IChannelSender, string, object) call to the next sink provider in the chain (if there is one), and ensures that the next sink and the current one are linked together.