using System;

using System.Linq;

using System.Collections.Generic;

using System.Collections.ObjectModel;

public class Program

{

    private ObservableCollection<string> deviceList = new();

    public static void Main()

    {

        var program = new Program();

        program.Initialize();

    }

    private void Initialize()

    {

        // Here is where you would initialize the ListCollectionView and use

        // the deviceList as the constructor argument

        //

        // ListCollectionView lcv = new ListCollectionView(deviceList);

        // cmb1.ItemsSource = lcv;

        // Here is where you would be getting your device list

        // I have assumed a string here but this could be any object

        var devices = new List<string>() { "A", "B", "C" };

        // Here we get devices which need adding to the list

        var adding = devices.Where(e => !deviceList.Contains(e));

        // Here we get devices which need removing from the list

        var removing = deviceList.Where(e => !devices.Contains(e));

        // Add and remove accordingly

        foreach (var device in adding)

            deviceList.Add(device);

        foreach (var device in removing)

            deviceList.Remove(device);

        // At this point the list collection view should have been

        // updated and those changes should be visible in the UI

    }

}