comparison of array and list with the dotnet 8

Program.cs

// original code is here: https://stackoverflow.com/a/454923

using System.Diagnostics;

Console.WriteLine("# Write once");

var elementCount = 6000000;
Random rand = new(12345);

var watch = Stopwatch.StartNew();
List<int> list = new(elementCount);
for (int i = 0; i < elementCount; i++)
{
	list.Add(rand.Next(5000));
}
watch.Stop();
Console.WriteLine($"List : {watch.ElapsedMilliseconds} [ms]");

watch = Stopwatch.StartNew();
int[] array = new int[elementCount];
for (int i = 0; i < array.Length; i++)
{
	array[i] = rand.Next(5000);
}
watch.Stop();
Console.WriteLine($"Array: {watch.ElapsedMilliseconds} [ms]");

Console.WriteLine("\n# Read 100 times");
Console.WriteLine("## for");

int chk = 0;
watch = Stopwatch.StartNew();
for (int rpt = 0; rpt < 100; rpt++)
{
	int len = list.Count;
	for (int i = 0; i < len; i++)
	{
		chk += list[i];
	}
}
watch.Stop();
Console.WriteLine($"List : {watch.ElapsedMilliseconds} [ms]");

chk = 0;
watch = Stopwatch.StartNew();
for (int rpt = 0; rpt < 100; rpt++)
{
	for (int i = 0; i < array.Length; i++)
	{
		chk += array[i];
	}
}
watch.Stop();
Console.WriteLine($"Array: {watch.ElapsedMilliseconds} [ms]");

Console.WriteLine("\n## foreach");

chk = 0;
watch = Stopwatch.StartNew();
for (int rpt = 0; rpt < 100; rpt++)
{
	foreach (int i in list)
	{
		chk += i;
	}
}
watch.Stop();
Console.WriteLine($"List : {watch.ElapsedMilliseconds} [ms]");

chk = 0;
watch = Stopwatch.StartNew();
for (int rpt = 0; rpt < 100; rpt++)
{
	foreach (int i in array)
	{
		chk += i;
	}
}
watch.Stop();
Console.WriteLine($"Array: {watch.ElapsedMilliseconds} [ms]");

here is sample output:

# Write once
List : 64 [ms]
Array: 60 [ms]

# Read 100 times
## for
List : 2447 [ms]
Array: 1649 [ms]

## foreach
List : 2237 [ms]
Array: 1515 [ms]