[C#] Numeral Systems/ Task - 06 Bin to Hex

using System;
class BinToHex
{
    static void ToHex(string num)
    {
        switch (num)
        {
            case "0000":
                Console.Write("0");
                break;
            case "0001":
                Console.Write("1");
                break;
            case "0010":
                Console.Write("2");
                break;
            case "0011":
                Console.Write("3");
                break;
            case "0100":
                Console.Write("4");
                break;
            case "0101":
                Console.Write("5");
                break;
            case "0110":
                Console.Write("6");
                break;
            case "0111":
                Console.Write("7");
                break;
            case "1000":
                Console.Write("8");
                break;
            case"1001":
                Console.Write("9");
                break;
            case"1010":
                Console.Write("A");
                break;
            case "1011":
                Console.Write("B");
                break;
            case"1100":
                Console.Write("C");
                break;
            case"1101":
                Console.Write("D");
                break;
            case"1110":
                Console.Write("E");
                break;
            case"1111":
                Console.Write("F");
                break;
            default:
                Console.WriteLine("Error!");
                break;
        }
    }

    static void Convert(int[] temp)
    {
        string convert = "";
        for (int i = 0; i < temp.Length; i++)
        {
            convert += temp[i];
        }
        ToHex(convert);
    }

    static void DivideArray(int[] arr)
    {
        int count = (arr.Length / 4) + (arr.Length % 4);
        for (int repeat = 0; repeat < count; repeat++)
        {
            int[] temp = new int[4];
            for (int main = 0; main < arr.Length; main+=4)
            {
                for (int i = 0; i < temp.Length; i++,main++)
                {
                    temp[i] = arr[main];
                }
                main -= 4;
                Convert(temp);
            }
        }
    }

    static void Main()
    {
        int[] num = { 0, 0, 1, 1, 1, 1, 1, 1 };

        DivideArray(num);
        Console.WriteLine();
    }
}