21. What does the 'params' keyword do in C# method parameters?
22. In C#, what is the role of the 'finally' block in a try-catch-finally statement?
23. What is the correct syntax to define a multi-line comment in C#?
24. What is the purpose of the 'static' keyword in C#?
25. What is the result of the expression 10 % 3 in C#?
26. Which of the following is NOT a valid C# comment style?
27. What is the default value of a boolean variable in C# if not explicitly initialized?
28. What does the 'using' directive do in C#?
29. In C#, what is the purpose of the 'this' keyword?
30. What is the correct way to declare a constant in C#?
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