Streaming ForEach using a yield

I’ve been looking for an article on converting foreachs into a less memory intensive operation and I remember reading http://msdn2.microsoft.com/en-us/vcsharp/bb264519.aspx before, I just couldn’t find it.

Basically it uses an example of all numbers in the New York phone book to develop a means of streaming the loops using custom iterators using yield instead of loading it all in and looping through it all.

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