public void FindNode() { OpcClient client = new OpcClient(new Uri("opc.tcp://127.0.0.1:26543/Workstation.RobotServer")); if (client.Connect == OpcStatus.Connected) { INode root = client.RootNode; IEnumerable <INode> list = client.ExploreFolder(root.Tag); IEnumerable <INode> server = client.ExploreFolder(list.ToList()[0].Tag); IEnumerable <INode> s = client.ExploreFolder(server.ToList()[0].Tag); } }