Parallel stepped for loops in .NET C# z

for (int i = 0; i < 20; i += 2)

public IEnumerable<int> SteppedIntegerList(int startIndex,
int endEndex, int stepSize)
{
for (int i = startIndex; i < endEndex; i += stepSize)
{
yield return i;
}
}

Parallel.ForEach(SteppedIntegerList(0, 20, 2), index =>
{
Console.WriteLine("Index value: {0}", index);
});