#Region "identifierString" ...code goes here #End Region
identifierString (required)
The title of the code block
The #Region...#End Region directive marks a block of code as an expandable and collapsible region in the Visual Studio editor.
Code blocks delineated with the #Region...#End Region directive are collapsed by default.
identifierString identifies the region when it is collapsed.
Multiline directives (such as #If) cannot be split across a #Region or #End Region boundary.