matching string on a list of strings, C#

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using System;
using System.Collections.Generic;
using System.Linq;

namespace Rextester { public class Program { public static void Main(string[] args) {

bool exists;
    string firstMatch;
    IEnumerable<string> matchingList;

var myList = new List<string>() { "foo", "bar", "foobar" };

exists = myList.Any(x => x.Contains("o")); // true
    Console.WriteLine($"exists: {exists}");

exists = myList.Where(x => x.Contains("o")).Any(); // true
    Console.WriteLine($"exists: {exists}");

firstMatch = myList.FirstOrDefault(x => x.Contains("o"));
    Console.WriteLine($"firstMatch: {firstMatch}"); // foo

firstMatch = myList.Where(x => x.Contains("o")).FirstOrDefault();
    Console.WriteLine($"firstMatch: {firstMatch}"); // foo
    
    firstMatch = myList.First(x => x.Contains("o"));
    Console.WriteLine($"firstMatch: {firstMatch}"); // foo

firstMatch = myList.Where(x => x.Contains("o")).First();
    Console.WriteLine($"firstMatch: {firstMatch}"); // foo
    
    try
    {
        firstMatch = myList.First(x => x.Contains("dark side"));
    }
    catch(InvalidOperationException e)
    {
        Console.WriteLine($"exception: {e}");
    }

firstMatch = myList.FirstOrDefault(x => x.Contains("dark side"));
    if(firstMatch is null)
    {
        Console.WriteLine("firstMatch is null");
    }

matchingList = myList.Where(x => x.Contains("o"));
    Console.WriteLine($"matchingList: {string.Join(", ", matchingList)}"); // "foo", "foobar"
            
}}}

Show compiler warnings [ + ] Show input
Compilation time: 0,25 sec, absolute running time: 0,12 sec, cpu time: 0,11 sec, average memory usage: 16 Mb, average nr of threads: 3, absolute service time: 0,41 sec