21. What is the default access modifier for class members in C# if no access modifier is specified?
22. What is the purpose of the readonly keyword when applied to a field in a class in C#?
23. In C#, what is the method called automatically when an object is no longer in use and is being destroyed?
24. What is the process of creating a new class based on an existing class in C# called?
25. In C#, what is the keyword used to explicitly call a base class constructor from a derived class constructor?
26. What is the concept in OOP that allows a class to have more than one method with the same name but different parameters in C#?
27. In C#, which method is automatically called when an object is created to initialize the object's state?
28. What is the keyword used to create an alias for a data type in C#?
29. In C#, what is the process of defining a new class within another class called?
30. What is the access modifier used to declare a class member that is accessible only within its own class in C#?
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