String Factorial Sorter, 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;

namespace Rextester
   
{
    
    //Orders in every possible way a giver string sequence   
   
    public class Program
    {
        public static void Main(string[] args)
        {
          String wordSequence = "1902";
          List<char> digitchar = new List<char>{};
          int counter = 0;
          int sort = 0;
          String orderedsequence = "";
            foreach(char c in wordSequence)
            {
                digitchar.Add(c);
                Console.WriteLine(c);
                counter = counter +1;
                
            }           
            do{
            for(int c = sort; c<counter;c++ )
            {                
                Console.WriteLine(digitchar[c]);
                orderedsequence = orderedsequence + digitchar[c];
            }
                sort=sort +1;                
            Console.WriteLine(orderedsequence);
            orderedsequence = "";
            } while(sort<counter);

}
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,14 sec, absolute running time: 0,09 sec, cpu time: 0,08 sec, average memory usage: 12 Mb, average nr of threads: 2, absolute service time: 0,26 sec