[Solved] What will be the output of this C# code?using (var writer = new StreamWriter("log.txt")) { writer.WriteLine("Hello"); } Console.WriteLine(File.ReadAllText("log.txt")); | C Sharp (C#)

C Sharp (C#) - File IO

What will be the output of this C# code?

using (var writer = new StreamWriter("log.txt"))
{
    writer.WriteLine("Hello");
}
Console.WriteLine(File.ReadAllText("log.txt"));

ACompilation error

BHello

CNo output, file is empty

DRuntime exception

Step-by-Step Solution

Solution:

Step 1: Understand StreamWriter inside using block
The writer writes "Hello" to the file and is disposed (closed) after the block.
Step 2: Reading file content after using block
File.ReadAllText reads the full content, which includes "Hello".
Final Answer:
Hello -> Option B
Quick Check:
using closes writer so file has content [OK]

Quick Trick: Using flushes and closes stream before reading file [OK]

Common Mistakes:

MISTAKES

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