Fixing Broken Lines with Regex, C#

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//Rextester.Program.Main is the entry point for your code. Don't change it.
//Compiler version 4.0.30319.17929 for Microsoft (R) .NET Framework 4.5

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text.RegularExpressions;

// aljodav
// http://rextester.com/users/376

namespace Rextester
{
    using BrokenLines=Rextester.Program;
    public class Program
    {
        public static void Main(string[] args)
        {
            // ***********************************************
            string allLines=string.Empty,line;
            while((line=Console.ReadLine())!=default(string)){
                allLines+=line+"\r\n";
            }
            // long line's just built ************************
            //Console.WriteLine(allLines);
            
            Console.WriteLine(new BrokenLines().Fix(allLines)); // that's all
        }
        
        public string Fix(string s){
            return Regex.Replace(s,"\"|\r\n",new MatchEvaluator(Fix));
        }
        
        private int _count=0;
        private string Fix(Match m){
            if(m.Value=="\""){++_count;return m.Value;}
            return _count%2==1?string.Empty:m.Value;
        }
    }
}

Show compiler warnings [ - ] Show input
Compilation time: 0,14 sec, absolute running time: 0,16 sec, cpu time: 0,16 sec, average memory usage: 15 Mb, average nr of threads: 4