Binary Hex Decimal Systems, C#

Binary Hex Decimal Systems

//Title of this code
//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 Main(string[] args)
        {
            
            long number = 473;
            
            //Convert Decimal to Binary
            Console.WriteLine("Binary: " + ConvertToBinary(number));
            
            //Convert Binary to Decimal
            Console.WriteLine("Decimal: " + ConvertToDecimal(number));
            
            //Decimal to Hex
            string hexValue = number.ToString("X");
            Console.WriteLine(hexValue);
            
            //Hex to Decimal
            long hex_int = strtol(1D9, NULL, 16);
            Console.WriteLine(hex_int);
            
        }
        
        //Method to convert number to Binary
        public static long ConvertToBinary(long number)
            
        {
            string result = "";
            long remainder = 0;
            string remainderString;
            
            while (number != 0)
            {
                remainder = number % 2;
                //Console.WriteLine(remainder);
                remainderString = remainder.ToString();
                result = result + remainder;
                number = number /2;
            }
            
            long finalResult = Convert.ToInt64(result);
            return finalResult;
            
        }
        
        public static double ConvertToDecimal(long number)
            
        {
            long lastNumber = 0;
            double result = 0;
            
  
            for (int i = 0; i < 10; i++)
            {
                 lastNumber = number % 10;
                
                 if (lastNumber != 0 && lastNumber !=1)
                {
                Console.WriteLine("This is not a correct Binary number...");
                return 0;
                }
                
                 if (lastNumber ==1)
                     result = result + Math.Pow(2, i);
                
                 number = number / 10;
                
            }

return result;
            
        }
        
        
    }
}


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