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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            DistinctTest(new int[] { 1, 1, 2, 2, 2, 3, 3, 3, 1, 2, 3, 4 });
            DistinctTest(new int[] { 1, 1, 1 });
        }

        private static void DistinctTest(int[] testArray)
        {
            Console.Write("Before : ");
            foreach (int value in testArray)
            {
                Console.Write(value.ToString() + ", ");
            }

            Console.Write(Environment.NewLine + "After : ");
            foreach (int value in GetDistinctValues<int>(testArray))
            {
                Console.Write(value.ToString() + ", ");
            }

            Console.WriteLine(Environment.NewLine);
        }

        static public T[] GetDistinctValues<T>(T[] array)
        {
            List<T> tmp = new List<T>();

            for (int i = 0; i < array.Length; i++)
            {
                if (tmp.Contains(array[i]))
                    continue;
                tmp.Add(array[i]);
            }

            return tmp.ToArray();
        }
    }
}