Writing more if else statements than necessary (C#)

I am a few days new to the C# language and wanted to challenge myself by writing a program to convert a normal integer to hexadecimal. I think this program works properly but I want to get rid of the second set of if/else statements, is it possible to rewrite the code in the while loop for that to happen?

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

namespace IntegerToHexadecimal
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Please Enter an integer");
            int input = Convert.ToInt32(Console.ReadLine());
            string output = "";

            int answer = input / 16;
            int remainder = input % 16;

            while (answer != 0)
            {

                if (remainder < 10) output = Convert.ToString(remainder) + output;
                else if (remainder == 10) output = "A" + output;
                else if (remainder == 11) output = "B" + output;
                else if (remainder == 12) output = "C" + output;
                else if (remainder == 13) output = "D" + output;
                else if (remainder == 14) output = "E" + output;
                else if (remainder == 15) output = "F" + output;
                else if (remainder == 16) output = "G" + output;

                input = answer;
                answer = input / 16;
                remainder = input % 16;

            }

            if (remainder < 10) output = Convert.ToString(remainder) + output;
            else if (remainder == 10) output = "A" + output;
            else if (remainder == 11) output = "B" + output;
            else if (remainder == 12) output = "C" + output;
            else if (remainder == 13) output = "D" + output;
            else if (remainder == 14) output = "E" + output;
            else if (remainder == 15) output = "F" + output;
            else if (remainder == 16) output = "G" + output;


            Console.WriteLine("Your number in hexadecimal is: 0x" + output);
            Console.ReadLine();

        }
    }
}