using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

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

        list.Add("1234 - Hello");

        list.Add("4234 - There");

        list.Add("2342 - World");

​

        string search = "There";

        IEnumerable<string> result = list.Where(s => s.Contains(search));

        Console.WriteLine(string.Join(",", result));

    }

}