using System;
using System.Linq;
using System.Collections.Generic;
 
public class Test
{
	private static List<string> Col1 = new List<string>
	{
		"Foo",
		"Bar",
		"Foobar",
		"Barfoo",
	};
 
	private static List<string> Col2 = new List<string>
	{
		"Foo",
		"Bar",
	};
 
	public static void Main()
	{
		Console.WriteLine(Col1.Where(e => GetCol2().Any(e2 => e2 == e)).Count().ToString());
	}
 
	private static List<string> GetCol2()
	{
		Console.WriteLine("test");
		return Col2;
	}
}

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