#region

#region is a preprocessor directive.Which is a block of code and it allows us to expand or collapse the code when using the outlining features of the MS visual studio code editor.
Syntax::
                             #region   MyRegion
                             
                                      //your code here 
                            
                            #endregion 

MyRegion is name you want to give to the region, which will appear in the visual studio code editor. A #region must be end with a #endregion.  
#region do not affect the intermediate language output.

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