C# Determine Duplicate in List [duplicate]

Answer 1

Not seen anybody do this yet so here is a little program I just wrote. It's simple enough. Using Contains(), though I don't know how scalable this method is.

       Console.WriteLine("Please enter 5 unique numbers....");
        List uniqueNums = new List() { };
        while (uniqueNums.Count < 5)
        {
            int input = Convert.ToInt32(Console.ReadLine());
            if (uniqueNums.Contains(input))
            {
                Console.WriteLine("Add a different number");
            }
            uniqueNums.Add(input);
        }
        uniqueNums.Sort();
        foreach (var n in uniqueNums)
        {
            Console.WriteLine(n);
        }