Question

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That’s said I have the #region comment in C# code.

#region if this comment is very long, can I divide the comment into multi-lines?

   // my code is here

#endregion

Is it possible to divide the #region comment into multi-lines like the bottom code ?

#region the comment is separated into
#region-2 two lines.

   // my code is here

#endregion

Answer 1

I don’t think long comments were the intended usage for the #region directive. When I think “region” I think things like “Private Members” or “Service Declarations” or “Overloaded Constructors” or a simple label of that nature.

If you have a long comment, I would instead include it at the top of the region, like this:

#region Some Region Name

    /**
     * Here is a decently lengthy comment which describes the
     * group of class members within the region.
     */

    /// <summary>
    /// A regular member's comment documentation.
    /// </summary>
    public int MyRegionProperty { get; set; }

    // etc...

#endregion

MSDN describes the part that comes after #region as a “name”, not a comment. Names should be descriptive enough to identify what’s in the region, nothing more.