using System;
using System.Collections.Generic;
using System.Text;
using System.IO;

namespace GetFiles
{
    class Program
    {
        static Stack<DirectoryInfo> directoryStack = new Stack<DirectoryInfo>();

        static void Main(string[] args)
        {
            Console.WriteLine("Application to find all the JPG files");
            Console.WriteLine("=====================================");
            Console.Write("Location:");

            string location = Console.ReadLine();

            // Delete file.txt
            if (File.Exists(@"C:\file.txt"))
                File.Delete(@"C:\file.txt");

            // Create DirectoryInfo instance
            DirectoryInfo di = new DirectoryInfo(location);

            // Add valid DirectoryInfo instance into stack
            if (di != null)
                directoryStack.Push(di);

            // stop looping when directoryStack items is equal to 0
            while (directoryStack.Count != 0)
                GetFiles();

            Console.WriteLine("Success");
            Console.ReadLine();
        }

        static void GetFiles()
        {
            StreamWriter sw = System.IO.File.AppendText(@"C:\file.txt");
            
            // Get latest Directory Information from stack
            DirectoryInfo currentDirectory = directoryStack.Pop();

            // Get all sub directories
            DirectoryInfo[] getDirectories = currentDirectory.GetDirectories();

            // Add all sub directories into stack
            for (int i = 0; i < getDirectories.Length; i++)
                directoryStack.Push(getDirectories[i]);

            // Get all jpg files
            FileInfo[] getFilesInfo = currentDirectory.GetFiles("*.jpg");

            // Write jpg full details into file.txt
            for (int j = 0; j < getFilesInfo.Length; j++)
                sw.WriteLine(getFilesInfo[j].FullName);

            sw.Close();
        }
    }
}