using System;

using System.Text.RegularExpressions;   

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        object[] resString =  {"1", "2"};

        foreach(var s in resString)

            Console.WriteLine(s);

            Console.WriteLine("\r\n");

        object[] resInt =  {1, 2, "3"};

        foreach(var n in resInt)

            if(n is int) // проверяем приведение int

                Console.WriteLine(n);

        Console.WriteLine("\r\n");

        foreach(var n in resInt)

            if(n is string) // проверяем приведение типа  string

                Console.WriteLine(n);

    }

}