Using statement with file streams in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to open a file stream using a using statement.

C Sharp (C#)

using (var fileStream = new FileStream("example.txt", [1]))
{
    // Read or write operations
}

Drag options to blanks, or click blank then click option'

AFileAccess.Read

BFileMode.Open

CFileShare.Read

DFileOptions.None

Attempts:

3 left

💡 Hint

Common Mistakes

Using FileAccess instead of FileMode as the second argument.

Using FileShare or FileOptions in place of FileMode.

The FileStream constructor requires a FileMode to specify how to open the file. FileMode.Open opens an existing file.

2fill in blank

medium

Complete the code to write text to a file using a StreamWriter inside a using statement.

C Sharp (C#)

using (var writer = new StreamWriter(new FileStream("output.txt", FileMode.Create)))
{
    writer.[1]("Hello, world!");
}

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AReadLine

BClose

CWriteLine

DFlush

Attempts:

3 left

💡 Hint

Common Mistakes

Using ReadLine which reads input instead of writing.

Calling Close explicitly inside using block (not needed).

WriteLine writes a line of text to the file. It is the correct method to write text inside the using block.

3fill in blank

hard

Fix the error in the using statement to properly dispose the FileStream after reading.

C Sharp (C#)

FileStream fs = new FileStream("data.txt", FileMode.Open);
using ([1])
{
    // Read from fs
}

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Afs

Bnew FileStream("data.txt", FileMode.Open)

CFileStream fs

DStreamReader fs

Attempts:

3 left

💡 Hint

Common Mistakes

Creating a new FileStream inside using instead of using the existing one.

Trying to declare the variable again inside using.

The using statement should use the existing fs variable to ensure it is disposed properly.

4fill in blank

hard

Fill both blanks to create a using statement that reads all text from a file.

C Sharp (C#)

using (var reader = new StreamReader(new FileStream("file.txt", [1])))
{
    string content = reader.[2]();
}

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AFileMode.Open

BReadToEnd

CReadLine

DFileMode.Create

Attempts:

3 left

💡 Hint

Common Mistakes

Using FileMode.Create which overwrites the file.

Using ReadLine which reads only one line.

FileMode.Open opens the file for reading, and ReadToEnd() reads all text from the file.

5fill in blank

hard

Fill all three blanks to write multiple lines to a file using a using statement and a loop.

C Sharp (C#)

using (var writer = new StreamWriter(new FileStream("log.txt", [1])))
{
    foreach (var line in lines)
    {
        writer.[2](line);
    }
    writer.[3]();
}

Drag options to blanks, or click blank then click option'

AFileMode.Create

BWriteLine

CFlush

DFileMode.Append

Attempts:

3 left

💡 Hint

Common Mistakes

Using FileMode.Create which erases existing content.

Not calling Flush, causing data not to be saved immediately.

FileMode.Append opens the file to add text at the end. WriteLine writes each line, and Flush ensures all data is written to the file.