Reading and connecting 5 lines from text file and writing them to other text file

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ReadFromFile
{
    class Program
    {
        static void Main(string[] args)
        {
             // Store your and name the file in your drive, in my case is C:\tmp\WriteLines.txt
            // Read each line of the file into a string array. Each element 
            // of the array is one line of the file. 
            string[] lines = System.IO.File.ReadAllLines(@"C:\tmp\WriteLines.txt");
            List<string> result = new List<string>();

            // Display the file contents by using a foreach loop.
            System.Console.WriteLine("Contents of WriteLines.txt = ");
            string temp = "";
            //int count = 0;
            for (int i = 0; i < lines.Length; i++)
            {
                if ((i+1) % 5 == 0)
                {
                    result.Add(temp);
                    //count++;
                    temp = "";
                }
                else
                {
                    temp += lines[i];
                }
            }
            foreach (string s in result)
            {
                Console.WriteLine(s);
            }

            // Keep the console window open in debug mode.
            Console.WriteLine("Press any key to exit.");
            System.Console.ReadKey();
        }
    }
}