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How should I implement such thing: I have a text file, which contains information about item in each line, one line - item title, other line - item price, third line - item description... Totaly there is 5 lines per items, and if I have 3 items there will be 15 lines.

How should I read the file line by line, that every 5 lines I could write them as one line in other text file?

Dummy info of text file nr. 1:
Lenovo netbook
SN4589 IoS
Fast computer
Lenovo 22 netbook
SN1233 IoS
Slow computer

Second text file after program actions:
Lenovo netbook 356.00$ SN4589 IoS Black Fast computer
Lenovo 22 netbook 99.00$ SN1233 IoS White Slow computer

I am reading lines with such code:
System.Collections.Generic.IEnumerable<String> lines = File.ReadLines("c:\\file.txt")

How to get number of lines array (file lines) and write every 5 lines as one line to new file?
Updated 7-May-13 13:21pm
Sergey Alexandrovich Kryukov 7-May-13 18:09pm    
Did you know that this is a site for software developers (and students). What is is, off-topic?
You should be able to read standard documentation and solve this problem by yourself. What did you try so far?
Tautvydas Deržinskas 7-May-13 18:22pm    
Sorry, I have updated my question.

No, File.ReadLines returns string[], each element of returned array representing, no to surprise, one line.

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Here it is the solution. I even tested for you.

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)
                    temp = "";
                    temp += lines[i];
            foreach (string s in result)

            // Keep the console window open in debug mode.
            Console.WriteLine("Press any key to exit.");
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Tautvydas Deržinskas 7-May-13 19:15pm    
Thank you Balimusi! Works fine. So to write to new file results I have to replace Console.WriteLine(s); yes?
Balimusi 7-May-13 19:25pm    
Yes, replace that Console.WriteLine() and write it to a file and that is stored in your drive.

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