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

public class Test
{
    

	public static void Main()
	{
            String[] someArray = { "Test1", "test2", "test3", "TEST4" };

            string toCheck = "TEST123";

            if (someArray.Any(str => toCheck.IndexOf(str, StringComparison.OrdinalIgnoreCase) > -1))
            {
                Console.Write("Contains!");
            }
            else
            {
                Console.Write("Does not contain!");
            }
	}
}