power of 2 ?

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace powerof2

{

    class Program

    {

       static void Main(string[] args)

       {

           int number, i=1,dup,flag=0;

           Console.WriteLine("enter the number ");

           number = Int32.Parse(Console.ReadLine());

           while (i <= 1000)

           {

               dup = i * 2;

               i = dup;

               if (dup == number)

               {

                

                   flag = 1;

                  

               }

           }

           if (flag == 1)

           {

               Console.WriteLine("no is power of 2");

           }

           else

           {

               Console.WriteLine("no is not power of 2");

           }

           Console.WriteLine();

       }

      

    }

}