[Solved] Find the issue in this code:string s = null;s += "World";Console.WriteLine(s); - Ans: Outputs World | C Sharp (C#)

C Sharp (C#) - Strings and StringBuilder

Find the issue in this code:

string s = null;
s += "World";
Console.WriteLine(s);

AThrows NullReferenceException

BOutputs nullWorld

COutputs World

DCompile error due to null string

Step-by-Step Solution

Solution:

Step 1: Understand += with null string
When s is null, s += "World" is equivalent to s = null + "World".
Step 2: Null treated as empty string
Concatenation treats null as empty string, so s becomes "World".
Final Answer:
Outputs World -> Option C
Quick Check:
Null string concatenated acts as empty string [OK]

Quick Trick: Null string plus text results in just the text [OK]

Common Mistakes:

MISTAKES

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