What is sealed class in c#?

Answer: 
Sealed classes are used to restrict the inheritance feature of object oriented programming. Once a class is defined as a sealed class, the class cannot be inherited. 

In C#, the sealed modifier is used to define a class as sealed. In Visual Basic .NET the Not Inheritable keyword serves the purpose of sealed. If a class is derived from a sealed class then the compiler throws an error. 

If you have ever noticed, structs are sealed. You cannot derive a class from a struct. 

The following class definition defines a sealed class in C#: 

1. // Sealed class  
2. sealed class SealedClass  
3. {  
4.   
5. }