C# Hide Base Class

[DonBytes]

I'm creating a library with some functions that I occasionally use ;) and was wondering if anyone can help me with a minor problem.

I have some file operations that I cba to write code for every time so I made 2 classes (one for Files and one for Directories). Then I realized they share 2-3 functions. Here's part of the code:

namespace Something.IO
{
    public abstract class Shared
    {
        public static String GetShortName(String Fullname)
        {
            ...
        }
    }
 
    public class File : Shared
    {
        ...
    }
 
    public class Directory : Shared
    {
        ...
    }
}

Is it possible to hide the class Shared somehow? I know I'm not supposed etc but if I really want to is it possible? Without having to write the code twice in each class?

[NitinSawant]

youcan use sealed keword to configure the class inaccessible for inheriting