PermuteAString, 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
{
    public class Program
    {
        
        public static void PermuteString(char []str ,int begin ,int end)
        {
            
            int i;
            int range = end - begin;

if (range == 1)
            {
                Console.WriteLine(str);
            }
            else
            {
                for (i = 0; i < range; i++)
                {
                    char temp;
                    temp = str[begin];
                    str[begin] = str[begin + i];
                    str[begin + i] = temp;

PermuteString(str, begin + 1, end);
                    temp = str[begin];
                    str[begin] = str[begin + i];
                    str[begin + i] = temp;

}
            }
        }
        
        public static void Main(string[] args)
        {
            char[] list = { 'a', 'b', 'c' };
            int i, j, k;

for (i = 0; i < 3; i++)
            {
                for (j = 0; j < 3; j++)
                {
                    for (k = 0; k < 3; k++)
                    {
                        {
                            if (i != j && j != k && i != k)
                            {
                                Console.WriteLine("{0}{1}{2}", list[i],list[j],list[k]);
                            }
                        }
                    }
                }
            }
            Console.WriteLine();
            PermuteString(list ,0 ,list.Length);
       }
    }
}

Show compiler warnings [ + ] Show input
Compilation time: 0,12 sec, absolute running time: 0,09 sec, cpu time: 0,09 sec, average memory usage: 14 Mb, average nr of threads: 3