A #region block cannot overlap with an #if block. However, a #region block can be nested in an #if block, and an #if block can be nested in a #region block.
Directive #region directive Foundation
Controls display of code in the source code editor
Syntax
<%#region <your text>%>
<%#end%>Description
The #region directive allows specifying a block of code that can be expanded or collapsed in the source code editor. By default, content embedded into a #region/#end directive is displayed collapsed and is not visible in the editor. Instead, only the text defined in <your text> is shown. This feature, called "code folding", can contribute significantly to source code readability.
The following screenshot illustrates the difference between code defined in a #region that is currently collapsed (folded away) and expanded.
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