How to Count the Number of 1 Bits in C# ?

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace AbundantcodeConsoleApp
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            // How to Count the Number of 1 Bits in C# ?
            int Input = 5;
            int NoOfBits = 0;
            while (Input > 0)
            {
                Input &= (Input - 1);
                NoOfBits++;
            }
            Console.WriteLine(NoOfBits);
            Console.ReadLine();
        }
       
       
        
    }
    
}