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    <p>Your second code isn't correct. I think the correct code is like this:</p> <pre><code>var accumulatedDelta= new Vector2[MAX_PARTICLES]; for(int i = 0; i &lt; _numActiveParticles; ++i) { accumulatedDelta = calculateForce(_activeParticles[i], accumulatedDelta); } for (int i = _numActiveParticles - 1; i &gt;= 0; i--) { int index = _activeParticles[i]; _delta[index] += accumulatedDelta[index] / MULTIPLIER; } </code></pre> <p>I don't know what <code>.net2</code> has and what doesn't. But you can simulate <code>Parallel.For</code> yourself.</p> <p>explanation of this overload of <code>Parallel.For</code> is this:</p> <p>First parameter: start index of loop</p> <p>Second parameter: end index of loop</p> <p>Third parameter: a delegate that will create task local data. for each every thread that <code>Parallel.For</code> use (a task) this delegate will be called and return <code>localInit</code> data.</p> <p>Fourth parameter: a delegate that act as body of <code>for</code>. In first execution of body delegate, this delegate will retrieve data that is created by previuse delegate (<code>localInit</code>). in every subsequent loop, body delegate can change <code>localInit</code> and then return that to next body execution. In last execution of body delegate, <code>localInit</code> data will be passed to last delegate.</p> <p>Last parameter: another delegate that will be called per each task, when task has finished it's work. <code>localInit</code> will be passed to this delegate. Because this delegate can be called concurrency by multiple tasks, you must protect your shared data.</p> <p><strong>Edit:</strong></p> <p>A version of <code>ParallelFor</code> can be like this:</p> <pre><code>public static void ParallerFor&lt;TLocal&gt;(int startIndex, int endIndex, Func&lt;TLocal&gt; initData, Func&lt;int, TLocal, TLocal&gt; body, Action&lt;TLocal&gt; finalizer) { int numThreads = Environment.ProcessorCount; int chunkOffset = ((endIndex - startIndex) / numThreads) + 1; Task[] tasks = new Task[numThreads]; Enumerable.Range(0, numThreads).ToList().ForEach(x =&gt; { int start = x * chunkOffset; int end = ((x + 1) * chunkOffset); end = end &gt; endIndex ? endIndex : end; tasks[x] = Task.Factory.StartNew(() =&gt; { TLocal init = initData(); for(int i = start; i &lt; end; ++i) { init = body(i, init); } finalizer(init); }); }); Task.WhenAll(tasks).Wait(); } </code></pre>
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    1. POConverting .NET 4 Threading to .NET 2
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    1. COUsing the Task class to reimplement Parallel.For is kind of mood. If you have one, you also have the other (both are .net 4 and up).
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    2. CO@Christian.K Thank for your mention. I don't know what kind of parallel helpers `.net 2` has, but replacing `task` with manual `thread` starting is a straightforward work.
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    3. COYou can check msdn. It will tell you. Note that a task is not the same as a thread (at least use the thread pool and not a plain thread). Generally, reimplementing TPL functionality is non trivial to get correct and efficient. Lots of material about that on the internet.
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