using System;

using System.Linq;

​

public class Program

{

    public static void Main(string[] args)

    {

        string[] data = { "one", "two", "three", "stop", "four", "five" };

        data.Select(item => process(item)).FirstOrDefault(res => !res);

    }

​

    static bool process(string text)

    {

        if (text == "stop")

            return false;

​

        Console.WriteLine(text);

        return true;

    }

}