perfect square or not?

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace perfectsquare

{

    class Program

    {

       static void Main(string[] args)

       {

           int i,number,flag=0;

           Console.WriteLine("enter the number");

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

           for (i = 0; i < 100; i++)

           {

               if (number ==i*i)

               {

                   flag = 1;

              

               }

               

           }

           if (flag == 1)

           {

               Console.WriteLine("number is perfect square");

           }

           else

           {

               Console.WriteLine("number is not perfect square");

           }

               Console.ReadLine();

       }

         

    }

   

}