Combine lines text file (with criteria)

Question

Dear all First of all I am pretty new to C# but learning quick! :) At this point I am working on a simple console app. This app should read through a text file and when it finds a line that not starts with a certain code (6 options like :20: or :86:) it should go one (or more) line back and appends the line without the code to the line with the code. Example: input: :86:1234567890 ABCD EFGH output: :86:1234567890ABCDEFGH Can someone point me in the correct direction or maybe post some code? Thanks in advance!!

Steef · Answer

Thank you very very much! This works perfectly!

Alan · Answer

Try this (requires .NET 2.0 or later): using System; using System.IO; using System.Collections.Generic; class Program { static void Main() { string[] input = File.ReadAllLines(steef.txt); List output = new List (); string temp = ; foreach (string line in input) { if (line.StartsWith(:20:) || line.StartsWith(:86:)) { if (temp != ) output.Add(temp); temp = line; } else if (line != ) { temp += line; } } output.Add(temp); // check it worked foreach(string line in output) { Console.WriteLine(line); } Console.ReadKey(); } }