File class static methods in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if a file exists at the given path.

C Sharp (C#)

bool exists = File.[1]("example.txt");

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AReadAllText

BExists

CDelete

DCopy

Attempts:

3 left

💡 Hint

Common Mistakes

Using ReadAllText instead of Exists causes runtime error if file missing.

Using Delete or Copy does not check existence.

The File.Exists method checks if the specified file exists and returns a boolean.

2fill in blank

medium

Complete the code to read all text from a file into a string.

C Sharp (C#)

string content = File.[1]("data.txt");

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AReadAllText

BWriteAllText

CAppendAllText

DDelete

Attempts:

3 left

💡 Hint

Common Mistakes

Using WriteAllText tries to write, not read.

AppendAllText adds text instead of reading.

File.ReadAllText reads the entire content of a text file into a string.

3fill in blank

hard

Fix the error in the code to copy a file from source to destination.

C Sharp (C#)

File.[1]("source.txt", "dest.txt");

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ADelete

BMove

CCopy

DExists

Attempts:

3 left

💡 Hint

Common Mistakes

Using Delete removes the file instead of copying.

Using Move moves the file instead of copying.

File.Copy copies a file from one path to another.

4fill in blank

hard

Fill both blanks to write text to a file, overwriting if it exists.

C Sharp (C#)

File.[1]("log.txt", [2]);

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AWriteAllText

B"Hello, world!"

C"Sample text"

DAppendAllText

Attempts:

3 left

💡 Hint

Common Mistakes

Using AppendAllText adds text instead of overwriting.

Passing a variable name instead of a string literal.

File.WriteAllText writes the given string to the file, replacing existing content.

5fill in blank

hard

Fill all three blanks to move a file only if it exists.

C Sharp (C#)

if (File.[1]("old.txt")) {
    File.[2]("old.txt", [3]);
}

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AExists

BMove

C"new.txt"

DCopy

Attempts:

3 left

💡 Hint

Common Mistakes

Using Copy instead of Move changes file behavior.

Not checking if file exists before moving.

First, File.Exists checks if the file is there. Then File.Move moves it to the new path "new.txt".