using System;

using System.Linq;

using System.Collections.Generic;

​

class Program

{

    static void Main(string[] args)

    {

        List<string> list = new List<string>{"apple", "banana", "watermelon", "mango"};

        Console.WriteLine($"List: {string.Join(", ", list)}");

​

        var allStrings = from s in list select s;

        Console.WriteLine($"All strings: {string.Join(", ", allStrings)}");

​

        string matchingString = "go";

        var matchingItem = (from s in list where s.Contains(matchingString) select s).First();

        Console.WriteLine($"Matching string: {matchingItem}");

    }

}

​