Programm.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace ExtensionsMethods

{

    

class Program

    {

        

static 

void DoWork()

        {

            

int x = 

591;

            

for (

int i = 

2; i <= 

10; i++)

            {

                Console.WriteLine(

"

{0} in base {1} is {2}

",x,i,x.ConvertToBase(i));

            }

        }

        

static 

void Main(

string[] args)

        {

            

try {

                DoWork();

            }

catch(Exception ex)

            {

                Console.WriteLine(ex.Message);

            }

        }

    }

}

 Util.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace ExtensionsMethods

{

   

static 

class Util

    {

        

public 

static 

int ConvertToBase(

this 

int i, 

int baseToConvertTo)

        {

            

if (baseToConvertTo < 

2 || baseToConvertTo > 

10)

            {

                

throw 

new ArgumentException(

"

Value cannot be converted to base

"+baseToConvertTo.ToString());

            }

            

int result = 

0;

            

int iterations = 

0;

            

do

            {

                

int nextDigit = i % baseToConvertTo;

                i /= baseToConvertTo;

                result += nextDigit * (

int)Math.Pow(

10, iterations);

                iterations++;

            } 

while (i != 

0);

            

return result;

        }

    }

}