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copied!<p>I would recommend you just use a normal <code>foreach</code> loop to transform the data. You're using a method that exists only on the <code>List<T></code> implementation, but not on arrays.</p> <p>Using a method for <code>foreach</code> really gains you nothing, unless for some reason you were wanting to do data mutation in a method chain. In that case, you may as well write your own extension method for <code>IEnumerable<T></code>. I would recommend against that, though.</p> <p>Having a separate <code>foreach</code> loop makes it clear to the reader that data mutation is occurring. It also removes the overhead of calling a delegate for each iteration of the loop. It will also work regardless of the collection type as long as it is an <code>IEnumerable</code> (not entirely true, you can write your own enumerators and enumerables, but that's a different question).</p> <p>If you're looking to just do data transformations (i.e. projections and the like) then use LINQ.</p> <p>Also keep in mind that with the array, you're getting a copy of the <code>byte</code> not a reference. You'll be modifying just that <code>byte</code> not the original. Here's an example with the output:</p> <pre><code>int[] numbers = new int[] { 1, 2, 3, 4, 5 }; Array.ForEach(numbers, number => number += 1); foreach(int number in numbers) { Console.WriteLine(number); } </code></pre> <p>Which yields the output:</p> <blockquote> <p>1 2 3 4 5</p> </blockquote> <p>As you can see, the number += 1 in the lambda had no effect. In fact, if you tried this in a normal <code>foreach</code> loop, you would get a compiler error. </p>

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