What is the difference between /// and #region in c#?

Question

What is the difference between ///

and #region ...#endregion statements in c#? Which one the best?

Answer 1

/// 

/// Three forward slashes denote a documentation comment, which can be used in
/// conjunction with documentation tooling to generate API documentation for
/// your code.
/// 

// two forward slashes denote a code comment, which you can use to provide
// commentary within your code

/*
This style of comment is called a block comment, which can be used to easily
comment out large blocks of text within your code
*/

#region Some Region Name

// the above region allows the developer to collapse/uncollapse everything
// within it, as long as their IDE supports regions
public void SomeMethod()
{
}

#endregion