using System;

using System.IO;

namespace ConsoleApplication1

{

    class Program

    {

        static void Main(string[] args)

        {

            DirectoryInfo di = new DirectoryInfo(@"C:\Users\tomfitz\Documents\ExampleDir");

            Console.WriteLine("No search pattern returns:");

            foreach (var fi in di.GetFiles())

            {

                Console.WriteLine(fi.Name);

            }

            Console.WriteLine();

            Console.WriteLine("Search pattern *2* returns:");

            foreach (var fi in di.GetFiles("*2*"))

            {

                Console.WriteLine(fi.Name);

            }

            Console.WriteLine();

            Console.WriteLine("Search pattern test?.txt returns:");

            foreach (var fi in di.GetFiles("test?.txt"))

            {

                Console.WriteLine(fi.Name);

            }

            Console.WriteLine();

            Console.WriteLine("Search pattern AllDirectories returns:");

            foreach (var fi in di.GetFiles("*", SearchOption.AllDirectories))

            {

                Console.WriteLine(fi.Name);

            }

        }

    }

}

/*

This code produces output similar to the following:

No search pattern returns:

log1.txt

log2.txt

test1.txt

test2.txt

test3.txt

Search pattern *2* returns:

log2.txt

test2.txt

Search pattern test?.txt returns:

test1.txt

test2.txt

test3.txt

Search pattern AllDirectories returns:

log1.txt

log2.txt

test1.txt

test2.txt

test3.txt

SubFile.txt

Press any key to continue . . .

*/