ДЗ: Объединение в одну коллекцию

using System;
using System.Collections.Generic;

namespace CSLight
{
    internal class Program
    {
        static void Main(string[] args)
        {
            string[] numbers = { "1", "2", "3", "3", "1", "1", "5" };
            string[] numbers2 = { "6", "6", "3", "3", "1", "5", "5" };
            List<string> reworkedList = new List<string>();

            TryAddValuesToList(reworkedList, numbers);
            TryAddValuesToList(reworkedList, numbers2);

            foreach (string value in reworkedList)
            {
                Console.Write(value);
            }

            Console.ReadKey();
        }

        private static void TryAddValuesToList(List<string> finalValues, string[] sourceValues)
        {
            for (int i = 0; i < sourceValues.Length; i++)
            {
                bool isSameValuesFound = false;

                for (int j = 0; j < finalValues.Count; j++)
                {
                    if (sourceValues[i] == finalValues[j])
                    {
                        isSameValuesFound = true;
                        break;
                    }
                }

                if (isSameValuesFound == false)
                {
                    finalValues.Add(sourceValues[i]);
                }
            }
        }
    }
}