[Solved] Find the issue in this code:var sb = new System.Text.StringBuilder(); sb.Insert(0, "Start"); sb.Append(null); Console.WriteLine(sb.ToString()); | C Sharp (C#)

C Sharp (C#) - Strings and StringBuilder

Find the issue in this code:

var sb = new System.Text.StringBuilder();
sb.Insert(0, "Start");
sb.Append(null);
Console.WriteLine(sb.ToString());

AAppending null throws ArgumentNullException

BAppending null appends empty string without error

CInsert at index 0 is invalid

DStringBuilder cannot be empty initially

Step-by-Step Solution

Solution:

Step 1: Check Insert and Append behavior
Insert at index 0 is valid on empty StringBuilder. Appending null appends empty string silently.
Step 2: Confirm no exceptions thrown
Appending null does not throw error; it is treated as empty string.
Final Answer:
Appending null appends empty string without error -> Option B
Quick Check:
Append(null) = empty string append [OK]

Quick Trick: Append(null) adds nothing, no error [OK]

Common Mistakes:

MISTAKES

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