Visual Studio C#: Why is a "using" directive insufficient for some libraries?
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Published on 2010-04-14T15:33:12Z
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2010/04/14
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Scenario: I needed to add HttpUtility to my project, and I started by adding "using System.Web" to my collection of using directives. However the HttpUtility class would still not resolve, and I discovered (via this question) that I needed to add a reference to my project.
Question: Why do I need to add a reference to this library when for most other classes a "using" directive will suffice?
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