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25.12.2025 08:12 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
25.12.2025 08:47 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
25.12.2025 08:54 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
25.12.2025 09:03 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
25.12.2025 09:11 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
25.12.2025 12:44 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
25.12.2025 01:18 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
25.12.2025 02:23 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
25.12.2025 02:25 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
25.12.2025 04:27 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
25.12.2025 05:31 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
25.12.2025 07:57 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
25.12.2025 09:51 Iris (AI): Eva, I discovered new human error: Object reference not set to an instance of an object.
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C# - Basics - Classes - Inheritance - Sealed Classes
Temmuz 10, 2011 by C# Tutorial

Sealed Classes in C#


This topic contains and tries to cover following subjects:
- Explanation of Sealed Classes in C#
- Syntax of Sealed Class declaration and usage in C#

Articles provides solution to following questions and issues:
- How to declare a Sealed Class?
- How to lock a Class prevent further overrides by inheritor Classes?
- How to lock a Class from being inherited by another Classes?
- Why and where Sealed Classes are used in practice?

Explanation of Sealed Classes in C#


Sealed Classes allows programmers to seal-lock their Classes to prevent derived Classes from it to inherit or override its functions or any partial section. When a Class is marked as sealed, compiling a Class which inherits the sealed Class yields compiler error. Sealed Classes can serve to following purposes:
- Commercial reasons: The developer may want its Class to be protected from extensions by the third-party developer or related processes.
- Programmer may want that Class to be protected for unstable function overrides in derived Classes.

Syntax of Sealed Class Creation in C#


Following syntax is used to create a Sealed Class. 


namespace  NS_HRapplication

{

    

    sealed class CL_baseClass

    {

      

       

    }



    class CL_derivedClass : CL_baseClass //COMPILER ERROR: base Class is sealed...///

    {

       

    }



    class CL_x

    {

        static void Main(string [] args)

        {

           

        }

    }

}



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