[Solved] Why does concatenating strings with the + operator inside a loop cause performance issues in C#? - Ans: Because strings are immutable and each + creates a new string | C Sharp (C#)

C Sharp (C#) - Strings and StringBuilder

Why does concatenating strings with the + operator inside a loop cause performance issues in C#?

ABecause strings are immutable and each + creates a new string

BBecause + operator is not supported in loops

CBecause it causes syntax errors

DBecause it modifies the original string in place

Step-by-Step Solution

Solution:

Step 1: Understand string immutability
Strings in C# cannot be changed after creation; concatenation creates new strings each time.
Step 2: Impact on performance in loops
Repeated concatenation in loops creates many temporary strings, causing slow performance and memory use.
Final Answer:
Because strings are immutable and each + creates a new string -> Option A
Quick Check:
String immutability causes performance issues with + in loops [OK]

Quick Trick: Use StringBuilder for efficient concatenation in loops [OK]

Common Mistakes:

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