prevent a class from being inherited

In C#, you can prevent a class from being inherited by using the sealed keyword in the class definition. When a class is marked as sealed, it cannot be used as a base class for other classes, and no class can inherit from it. Here's an example:

csharpCopy codesealed class MySealedClass
{
    // Class implementation...
}

In this example, the MySealedClass is marked as sealed, which means that it cannot be inherited from. If you try to inherit from this class, the C# compiler will generate an error.

Note that you can only use the sealed keyword on classes that are not themselves derived from other classes. If a class is derived from another class, it cannot be marked as sealed. Also, the sealed keyword can only be used on classes, not on interfaces or other types.