Which of the following is the correct syntax to open a file for reading using a using statement in C#?

easy📝 Syntax Q12 of 15

C Sharp (C#) - File IO

Which of the following is the correct syntax to open a file for reading using a using statement in C#?

Ausing FileStream fs = new FileStream("file.txt", FileMode.Open);

Busing var fs = FileStream("file.txt", FileMode.Open);

Cusing (var fs = new FileStream("file.txt", FileMode.Open)) { }

Dusing (FileStream fs = FileStream.Open("file.txt")) { }

Step-by-Step Solution

Solution:

Step 1: Recognize correct using block syntax
The using statement requires parentheses around the resource declaration and a block of code inside braces.
Step 2: Check each option
using (var fs = new FileStream("file.txt", FileMode.Open)) { } uses using (var fs = new FileStream(...)) { } which is correct. using var fs = FileStream("file.txt", FileMode.Open); misses parentheses. using FileStream fs = new FileStream("file.txt", FileMode.Open); misses braces. using (FileStream fs = FileStream.Open("file.txt")) { } uses a non-existent method FileStream.Open.
Final Answer:
using (var fs = new FileStream("file.txt", FileMode.Open)) { } -> Option C
Quick Check:
Using needs parentheses and braces [OK]

Quick Trick: Using needs parentheses and braces for resource block [OK]

Common Mistakes:

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