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You want to write multiple lines to a file and ensure the file is closed properly even if an exception occurs. Which code snippet correctly uses the using statement for this?

hard🚀 Application Q8 of Q15

C Sharp (C#) - File IO

You want to write multiple lines to a file and ensure the file is closed properly even if an exception occurs. Which code snippet correctly uses the using statement for this?

Ausing (var writer = new StreamWriter("file.txt")) { writer.WriteLine("Line1"); writer.WriteLine("Line2"); }

Bvar writer = new StreamWriter("file.txt"); writer.WriteLine("Line1"); writer.WriteLine("Line2"); writer.Close();

CStreamWriter writer; using writer = new StreamWriter("file.txt"); writer.WriteLine("Line1");

Dusing StreamWriter writer = StreamWriter("file.txt"); writer.WriteLine("Line1");

Step-by-Step Solution

Solution:

Step 1: Check proper using statement syntax
using (var writer = new StreamWriter("file.txt")) { writer.WriteLine("Line1"); writer.WriteLine("Line2"); } uses using with braces and new StreamWriter correctly.
Step 2: Verify resource safety
Using ensures writer is disposed even if exceptions occur during writing.
Final Answer:
using (var writer = new StreamWriter("file.txt")) { writer.WriteLine("Line1"); writer.WriteLine("Line2"); } -> Option A
Quick Check:
Using with braces ensures safe file writing [OK]

Quick Trick: Use using with braces for multiple writes safely [OK]

Common Mistakes:

MISTAKES

Not using using causes resource leaks on exceptions
Incorrect using syntax without new keyword
Trying to declare using without var or type

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