Using IEqualityComparer and Lambda Expressions

Anyone using LINQ to manipulate in-memory collections is probably
also using plenty of lambda expressions to make things quite easy.
These two additions were really meant for each other. One of our
interns here recently ran into an interesting problem while using LINQ.
As a relatively new user of .NET based languages, reference types
caused him a bit of trouble.

The [...]

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How to Get a List of Files and Folders Without Directory.GetFiles Access Denied Error

I know the title is a bit long, but it descriptive of the problem.
Recently I had need to retrieve a listing of files and folders given a
root path. All worked well, until I tested on Vista and Windows 7
machines. When trying to browse the "Users" folder, I kept getting
access denied errors and no lists returned. [...]

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