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private static void TestIntArray()
{
int [] array = new int[1000];
for (int i = 0; i < 1000; i++)
array[i] = i;
}

private static void TestArrayList()
{
ArrayList array = new ArrayList();
for (int i = 0; i < 1000; i++)
array.Add(i);
}

// Code….

long start = DateTime.Now.Ticks;
TestIntArray();
long end = DateTime.Now.Ticks;
Console.WriteLine(“Time with int array: {0}”, end – start);

long start2 = DateTime.Now.Ticks;
TestArrayList();
long end2 = DateTime.Now.Ticks;
Console.WriteLine(“Time with ArrayList array: {0}”, end2 – start2);

The result:

Time with int array: 30000
Time with ArrayList array: 10000

So, working with ArrayList is faster. Hm…

If we have multidimensional array and Dictionary<int, int> the difference is even bigger:

private static void TestIntArray()
{
int [ , ] array = new int[1000, 1000];
int i = 0;
for (int j = 0; j < 1000; j++)
array[i , j] = i++;
}

private static void TestDictionary()
{
Dictionary<int, int> array = new Dictionary<int, int>();
int i = 0;
for (int j = 0; j < 1000; j++)
array.Add(j, i++);
}

Time with int array: 60000
Time with Dictionary: 10000

Interesting