I recently had an interesting scenario that was presented to me by a customer: they had a business requirement where they needed to give the same username and password to a group of people, but they didn't want any two people to be able to see anyone
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Read the complete post at http://blogs.iis.net/robert_mcmurray/archive/2011/11/02/how-to-use-managed-code-c-to-create-an-ftp-home-directory-provider-that-is-based-on-the-remote-client-ip-address.aspx