Binary representation of given 16-bit signed integer

using System;
using System.Collections.Generic;

class BinaryOfSShort
{
    static void Main()
    {
        string number = Console.ReadLine();  // read short number
        bool signNegative = false;           // check if input is < 0
        if (Int16.Parse(number) < 0)
        {
            signNegative = true;
        }
        ShowShortInBinary(signNegative, number);

    }

    static void ShowShortInBinary(bool sign, string input)
    {
        if (sign == false)                                // if digit is < 0
        {
            PrintArray(ReverseArray(DecimalToBinary(input)));
        }

        else                                              // Two's complement
        {
            byte bit = 1;
            int number = Math.Abs(Int32.Parse(input));
            input = Convert.ToString(number);
            List<byte> inputArr = ChangeDigits(input);
            for (int i = 0; i < inputArr.Count; i++)
            {
                if (inputArr[i] + bit == 2)
                {
                    inputArr[i] = 0;
                    bit = 1;
                }
                else if (bit == 1)
                {
                    inputArr[i] = 1;
                    bit = 0;
                }
                if (i == (inputArr.Count - 1) && inputArr[i] == 0)
                {
                    inputArr[i] = 1;
                    break;
                }
            }
            PrintArray(ReverseArray(inputArr));

        }

    }

    static List<byte> AddInputToShort(List<byte> input)  // if not make the binary 16 digits
    {
        for (int i = 16 - input.Count - 1; i >= 0; i--)
        {
            input.Add(0);
        }

        return input;

    }

    static List<byte> DecimalToBinary(string num)
    {
        List<byte> arr = new List<byte>();
        int dec = Int32.Parse(num);
        while (dec >= 1)
        {
            arr.Add((byte)(dec % 2));
            dec = (short)(dec / 2);
        }

        return arr;
    }

    static List<byte> ChangeDigits(string num)   // convert 0 to 1, and 1 to 0
    {
        List<byte> changedDigitsNum = new List<byte>();
        List<byte> numArray = DecimalToBinary(num);
        numArray = AddInputToShort(numArray);
        for (int i = 0; i < numArray.Count; i++)
        {
            if (numArray[i] == 1)
            {
                changedDigitsNum.Add(0);
            }

            else
            {
                changedDigitsNum.Add(1);
            }

        }

        return changedDigitsNum;
    }

    static List<byte> ReverseArray(List<byte> arr)
    {
        List<byte> reversed = new List<byte>();
        for (int i = 0; i < arr.Count; i++)
        {
            reversed.Add(arr[arr.Count - 1 - i]);
        }

        return reversed;
    }

    static void PrintArray(List<byte> arr)
    {
        if (arr.Count <= 16)
        {
            for (int i = 16 - arr.Count; i > 0; i--)
            {
                Console.Write("0");
            }

        }

        for (int i = 0; i < arr.Count; i++)
        {
            Console.Write(arr[i]);
        }

    }

}