Copying the contents of one string to another in C#.NET: choose the statement that correctly creates a new string with the same contents as an existing one.

Introduction / Context:
Copying strings can mean either copying the reference (two variables refer to the same instance) or creating a distinct string object with the same contents. This question targets creating a separate string instance with identical content.

Given Data / Assumptions:

• We want to 'copy the contents' of one string into another.
• Options include assignment, String.Concat, String.Copy, and invalid usages.

Concept / Approach:
Assignment (s2 = s1) copies the reference, not the object; both variables point to the same immutable instance. String.Copy(s1) historically created a new string instance with the same content (note: it is obsolete in newer .NET, but within classic C#.NET contexts, it denotes a content copy). Concat concatenates and does not copy content alone. Replace() without arguments is invalid, and StringCopy is not an API.

Step-by-Step Solution:

Verification / Alternative check:
Another way to ensure a distinct instance is new string(s1.ToCharArray()), though rarely necessary. Since strings are immutable, reference sharing is usually safe.

Why Other Options Are Wrong:
They either do not produce a new object with the same contents or call invalid/nonexistent APIs.

Common Pitfalls:
Assuming assignment duplicates the object; in .NET it only assigns the reference.

Final Answer:
String s1 = 'String'; \nString s2;\ns2 = String.Copy(s1);