Referencing source code using a region

[JamesNK]

I use Sandcastle's code snippet plugin a lot. In your documentation it mentions referencing a file and then either specifying line numbers or a tag. What is a tag in C#? Sandcastle lets you specfiy a C# #region and that content is imported

<code lang="cs" source="..\Src\Newtonsoft.Json.Tests\Documentation\Samples\Json\CustomJsonReader.cs" region="Usage" title="Usage" />

I like #region because it is part of the language and messing them up results in a compilation error.

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From #148