What is the best way to modify a list in a ‘foreach’ loop?

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The collection used in foreach is immutable. This is very much by design.

As it says on MSDN:

The foreach statement is used to
iterate through the collection to get
the information that you want, but can
not be used to add or remove items
from the source collection to avoid
unpredictable side effects. If you
need to add or remove items from the
source collection, use a for loop.

The post in the link provided by Poko indicates that this is allowed in the new concurrent collections.

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