Merging into one collection

using System;
using System.Collections.Generic;

namespace ConsoleApp3
{
    internal class Program
    {
        static void Main(string[] args)
        {
            string[] array1 = CreateArray();
            string[] array2 = CreateArray();
            List<string> numbers = new List<string>();

            CombineArrays(numbers, array1);
            CombineArrays(numbers, array2);
            PrintCombinedArrays(numbers);
        }

        static Random random = new Random();

        static string[] CreateArray()
        {
            int arrayLengthMin = 5;
            int arrayLengthMax = 10;
            int arrayLength = random.Next(arrayLengthMin, arrayLengthMax);
            string[] array = new string[arrayLength];
            int arrayValueMax = 11;

            for (int i = 0; i < array.Length; i++)
                array[i] = Convert.ToString(random.Next(arrayValueMax));

            return array;
        }

        static void CombineArrays(List<string> numbers, string[] array)
        {
            foreach (string number in array)
                if (numbers.Contains(number) == false)
                    numbers.Add(number);
        }

        static void PrintCombinedArrays(List<string> numbers)
        {
            Console.Write("\nОбъединенный массив: ");

            foreach (string number in numbers)
                Console.Write(number + " ");
        }
    }
}