using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {   

        List<string> list = new List<string>();

        string srch = "There";

        list.Add("1234 - Hello");

        list.Add("4234 - There");

        list.Add("2342 - World");

        var srch = "There";

        string result = list.FirstOrDefault(s => s.Contains(srch));

        Console.WriteLine(result);

        var paymentOptions = new List<string> {"Net 20 Days", "Net 45 Days", "Net 10 Days"};

        const string paymentMethod= "PO NET 45";

        //string result = paymentOptions.FirstOrDefault(s => s.Contains(paymentMethod));

        //Console.WriteLine(result.Any());

        //var item = paymentOptions.SingleOrDefault(x=> x.ToLower().Contains(paymentMethod.ToLower()));

        //if (item !=null)

        {

            Console.WriteLine("Payment Method found");

        }

        else

        {

            Console.WriteLine("Payment Method not found");

            var items = paymentOptions.Where(customerToPaymentOption => paymentMethod.IndexOf(paymentMethod, System.StringComparison.Ordinal) > 0);

            Console.WriteLine(items.Count());

        }       

    }

}