using System;

using System.Collections.Generic;

using System.Linq;

using System.Xml.Linq;

using System.Globalization;

​

public class Program

{

    public static void Main()

    {

        // set up an example string array

        string[] lines = new string[] { 

            "line 1 should be ignored",

            "line 2 doesn't end in the right word",

            "line 3 ends in device",

            "line 4 doesn't end in the right word",

            "line 5 ends in device",

            "line 6 ends in device"

        };

        // Set up a dummy combo box as a List<string>

        List<string> combo = new List<string>();

        //Add the valid lines to the list

        lines.ToList().GetRange(1, lines.Count() - 1).Where(line => line.EndsWith("device")).ToList().ForEach(validLine => combo.Add(validLine.Remove(validLine.Length - 7)));

        //Write out the contents of the dummy combo box

        combo.ForEach(c => Console.WriteLine(c));

    }

}