Answer / vijay sharma

We can prevent classes to be inherited by marking the
classes as sealed.

Answer / jaffer

By using Sealed keyword before class.

Answer / nitin kumar tomar

just make the class sealed like

sealed public class classname

Answer / chvramana

Using Keyword Sealed. You can created Sealed class and
You can prevent the class to be inherited.

Answer / usha

make the class as sealed class

Answer / dhiraj kumar pandey

We can prevent classes to be inherited by using the key
word SEALED.

Answer / asit nutiyal(birla)

sealed modifier is used for preventing the accident
inhritance of a class. A sealed class can not be inhrited.

Example :

using system;

sealed class abc
{
protected string str = "";

public virtual void hello()
{
str = " Hi i am not in C#";
}
class xyz : abc //--ERROR--
{
public override void hell0()
{
str = "hi i am in C#";
Console.WriteLine("{0}",str);
}
}
class mainclass
{
public static void Main()
{
xyz x = new xyz();
x.hello();
}
}

Note-> if we run above program thn we will get an error
because we inheit class abc while it is sealed.

Answer / dhara

we can prevent class to be inherite by making sealed class
by using keyword sealed.

Answer / nagesh rajarapu

by using sealed keyword before the class name

Answer / lucky

make the constructor private.

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