You want to concatenate a list of three strings words into a single string separated by commas. Which approach correctly uses string concatenation behavior in C#?

hard🚀 Application Q8 of 15

C Sharp (C#) - Strings and StringBuilder

You want to concatenate a list of three strings words into a single string separated by commas. Which approach correctly uses string concatenation behavior in C#?

Astring.Join(",", words)

BAll of the above

Cwords[0] + "," + words[1] + "," + words[2]

Dwords.Aggregate((a, b) => a + "," + b)

Step-by-Step Solution

Solution:

Step 1: Understand string concatenation for lists
string.Join joins strings with a separator; manual + concatenation also works; Aggregate can combine with + operator.
Step 2: Validate each option
string.Join(",", words) uses built-in join; words[0] + "," + words[1] + "," + words[2] manually concatenates three elements; words.Aggregate((a, b) => a + "," + b) uses Aggregate with +. All are valid ways.
Final Answer:
All of the above -> Option B
Quick Check:
Multiple ways to concatenate lists of strings [OK]

Quick Trick: Use string.Join or + to combine string lists [OK]

Common Mistakes:

MISTAKES

Thinking only string.Join works
Assuming manual + is invalid
Not knowing Aggregate can concatenate

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You want to concatenate a list of three strings words into a single string separated by commas. Which approach correctly uses string concatenation behavior in C#?

Step 1: Understand string concatenation for lists

Step 2: Validate each option

Final Answer:

Quick Check:

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