Usage of #region ,#undefine

What is usage of #region and #undefine in C#.NET?Please by example

I use #region all the time. it is a way to keep similar code blocks together. This is the way that I use it.

Code:

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#region Button Click Events

  ......  All of my button click events .....

#endregion

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It will now allow me to collapse all of the button click events into one line. For me, it helps keep the code looking cleaner.

Quote:

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Originally Posted by Abalfazl

What is usage of #region and #undefine in C#.NET?Please by example

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Won't MSDN have all the information that you are looking for?

Look at #undef

#region is a code view only decoration that is used by coders who write bloated code.

I cringe most times I see them used because its typically used to collapse hundreds of lines of useless code.