#Region...#End Region Directive
"identifier_string"' code goes here #End Region
identifier_string(required; String literal)
The title of the code block (or region)
Marks a block of code as an expandable and collapsible region or code block in the Visual Studio .NET editor
Code blocks delineated with the
#End Region directive
are collapsed by default.
identifier_string serves as the title to
identify the region when it is collapsed.
Code blocks defined by other directives (such as
#If) must be entirely contained within the
#End Region block.