using System;
using System.Collections.Generic;
using System.Linq;
 
 
namespace Enum
{
    class Program
    {
        static void Main(string[] args)
        {
            List<string> S = new List<string>() { "alan.foo", "bob.htm", "dave.tea", "other.yuy" };
            List<string> X = new List<string>() { ".foo", ".htm", ".tea" };
 
            var newlist = S.Where(x => X.Any(y => x.EndsWith(y)));
 
            foreach (var item in newlist)
            {
                Console.WriteLine(item);
            }
        }
    }
}
 

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