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//Title of this code
//Rextester.Program.Main is the entry point for your code. Don't change it.

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

namespace Rextester
{
    public class Program
    {
        public static void Main(string[] args)
        {
            //Your code goes here
            Console.WriteLine(ConvertToReadableNumber(1.0M));
            Console.WriteLine(ConvertToReadableNumber(-1.0M));
            Console.WriteLine(ConvertToReadableNumber(123.45M));
            Console.WriteLine(ConvertToReadableNumber(123456789.45M));
            Console.WriteLine(ConvertToReadableNumber(-123456789.45M));
        }
        
        public static string ConvertToReadableNumber(decimal num)
       {
           bool isNegative = num<0;
           num = Math.Floor(num);
           string numTxt = Math.Abs(num).ToString();
           string numReadable = "";
           int counter =0;
           for (int i = numTxt.Length-1; i >=0; i--)
           {
               if (counter > 0 && counter % 3 == 0)
                   numReadable = "," + numReadable;
               numReadable = numTxt[i] + numReadable;
               counter++;
           }
           if(isNegative)
               numReadable = "-"+numReadable;
           return numReadable;
       }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0.26 sec, absolute running time: 0.12 sec, cpu time: 0.12 sec, average memory usage: 19 Mb, average nr of threads: 2