C#.NET — Can you prevent outside code from creating an instance by using (or controlling) the parameterless constructor? Give the precise rule used in C# object-oriented design.

Introduction / Context:
Many C#.NET design scenarios require controlling who can create objects. A common pattern is to restrict or disable public instantiation to enforce factory patterns, singletons, or utility-only classes. The question asks whether this is possible via the parameterless (zero-argument) constructor.

Given Data / Assumptions:

• Class has (or could have) a parameterless constructor.
• Goal: prevent external code from directly calling new and creating an instance.
• We are working within standard C# language rules.

Concept / Approach:
In C#, access modifiers control visibility. A parameterless constructor declared private (or internal) prevents outside callers from instantiating the class directly. Additional design options include marking the class static (which forbids instance construction entirely) or exposing only factory methods while making constructors non-public.

Step-by-Step Solution:

Verification / Alternative check:
Attempt to instantiate from another class with a private parameterless constructor will produce a compile-time error, confirming prevention of external creation.

Why Other Options Are Wrong:

• No: Incorrect because access modifiers on constructors explicitly control instantiation rights.

Common Pitfalls:
Assuming a public parameterless constructor is required by the runtime. It is not; you can omit it or make it non-public based on design needs.

Final Answer:
Yes