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This property returns the number of server instances for the System.IO.Pipes.NamedPipeServerStream object that the current System.IO.Pipes.NamedPipeClientStream object has a handle to or is connected to. If the current System.IO.Pipes.NamedPipeClientStream object has not yet connected to a named pipe server, or if the current pipe handle has not yet been set, this property throws an InvalidOperationException.