How can I limit Parallel.ForEach?

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You can specify a MaxDegreeOfParallelism in a ParallelOptions parameter:

Parallel.ForEach(
    listOfWebpages,
    new ParallelOptions { MaxDegreeOfParallelism = 4 },
    webpage => { Download(webpage); }
);

MSDN: Parallel.ForEach

MSDN: ParallelOptions.MaxDegreeOfParallelism

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