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A short and sweet quiz with lots of juicy discussion possibilities:

public int Sum(IList<ushort> indices)
{
int result = 0;
for (int i = 0; i < indices.Count; i++)
result += indices[i];
return result;
}

Considering only the time it takes to do the Sum (i.e. assuming we had already set up the array/list) which gives better performance and why?

// #1
ushort[] tmp = new ushort[500000]; // this doesn't count
Sum(tmp);// this is what we are timing

OR

// #2
List<ushort> tmp = new List<ushort>(500000); // this doesn't count
for (int i = 0; i < 500000; i++)tmp.Add(0); // this doesn't count
Sum(tmp); // this is what we are timing

What say you gentle readers?

Wrong

        System.Diagnostics.Stopwatch s = new System.Diagnostics.Stopwatch();

        s.Start();
        for (i = 0; i  count; i++) Test1();
        s.Stop();
        Console.WriteLine("Test1: {0}", s.ElapsedMilliseconds);

        s.Start();
        for (i = 0; i  count; i++) Test2();
        s.Stop();

        Console.WriteLine("Test2: {0}", s.ElapsedMilliseconds);

Right

        System.Diagnostics.Stopwatch s = new System.Diagnostics.Stopwatch();

        s.Start();
        for (i = 0; i  count; i++) Test1();
        s.Stop();
        Console.WriteLine("Test1: {0}", s.ElapsedMilliseconds);

        s.Reset();

        s.Start();
        for (i = 0; i  count; i++) Test2();
        s.Stop();

        Console.WriteLine("Test2: {0}", s.ElapsedMilliseconds);

Not that *cough* I would ever make this mistake or anything, but you know... it could happen to like, a friend, or something. Ya. My friend. :)

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