What is the purpose of sealed method in C#?

Using a sealed keyword along with a method means that the method cannot be overridden by the next level of derived classes. But there is a constraint while using sealed method: sealed method should be part of a derived class and the method must be an overridden method.

namespace Application1 {
class baseClass {
public virtual void sampleMethod() {
Console.WriteLine("Executing sampleMethod of baseClass");
}
}
class derivedClass:baseClass {
public sealed override void sampleMethod() {
Console.WriteLine("Executing sampleMethod of derivedClass");
}
}
class derivedClass2 : derivedClass {
public override void sampleMethod() {
Console.WriteLine("Executing sampleMethod of derivedClass2");
}
}
}

In this example, you try to override the sealed method sampleMethod of derivedClass in derivedClass2. This is not permissible and you will end up in the following error:

'Application1.derivedClass2.sampleMethod()': cannot override inherited member 'Application1.derivedClass.sampleMethod()' because it is sealed

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