using System;

public class Program

{

    public static void Main()

    {

        System.Collections.Generic.List<string> t = new System.Collections.Generic.List<string>(new string[]{"aa.xml", "bb.txt"});

        string resp = t.Contains(".xml")?"Yes":"No";

        Console.WriteLine(resp);

​

        int xmlCnt = 0;

        foreach(string name in t) {if (name.Contains(".xml")) xmlCnt++;}

        resp = xmlCnt != 1?"Got Issues":"No Problems";

        Console.WriteLine(resp);

    }   

}