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    <p>[edit]: to clarify; this is useful in the generic LINQ / <code>IEnumerable&lt;T&gt;</code> context, where you <strong>can't use</strong> an indexer, because a: it doesn't exist on an enumerable, and b: you can't guarantee that you can read the data more than once. Since the OP mentions lambdas, it occurs that LINQ might not be too far away (and yes, I do realise that LINQ and lambdas are not quite the same thing).</p> <p>It sounds like you need the missing <code>Zip</code> operator; you can spoof it:</p> <pre><code>static void Main() { int[] left = { 1, 2, 3, 4, 5 }; string[] right = { "abc", "def", "ghi", "jkl", "mno" }; // using KeyValuePair&lt;,&gt; approach foreach (var item in left.Zip(right)) { Console.WriteLine("{0}/{1}", item.Key, item.Value); } // using projection approach foreach (string item in left.Zip(right, (x,y) =&gt; string.Format("{0}/{1}", x, y))) { Console.WriteLine(item); } } // library code; written once and stuffed away in a util assembly... // returns each pais as a KeyValuePair&lt;,&gt; static IEnumerable&lt;KeyValuePair&lt;TLeft,TRight&gt;&gt; Zip&lt;TLeft, TRight&gt;( this IEnumerable&lt;TLeft&gt; left, IEnumerable&lt;TRight&gt; right) { return Zip(left, right, (x, y) =&gt; new KeyValuePair&lt;TLeft, TRight&gt;(x, y)); } // accepts a projection from the caller for each pair static IEnumerable&lt;TResult&gt; Zip&lt;TLeft, TRight, TResult&gt;( this IEnumerable&lt;TLeft&gt; left, IEnumerable&lt;TRight&gt; right, Func&lt;TLeft, TRight, TResult&gt; selector) { using(IEnumerator&lt;TLeft&gt; leftE = left.GetEnumerator()) using (IEnumerator&lt;TRight&gt; rightE = right.GetEnumerator()) { while (leftE.MoveNext() &amp;&amp; rightE.MoveNext()) { yield return selector(leftE.Current, rightE.Current); } } } </code></pre>
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    1. COI've edited to add context...
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    2. CONice, but is there a reason to make it an extension method?
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    3. COit makes it a bit more available - i.e. hit "." and it appears, as opposed to having to know about SomeUtilityClass.Zip(...); it also fits quite nicely with the other extension methods for IEnumerable<T>, so I'm comfortable with it as an extension method.
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