.NET SDK Installation and Setup in C Sharp (C#) - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Output of .NET SDK Version Check Command

What is the output of running the command dotnet --version after installing the .NET SDK version 7.0.100?

A Microsoft .NET SDK 7.0.100

B dotnet version 7.0.100

C 7.0.100

D Error: command not found

💡 Hint

The dotnet --version command prints only the version number of the installed SDK.

The dotnet --version command outputs the exact version number of the installed .NET SDK, such as '7.0.100'. It does not print extra text or error messages if the SDK is installed correctly.

🧠 Conceptual

intermediate

Understanding .NET SDK and Runtime Relationship

Which statement correctly describes the relationship between the .NET SDK and the .NET Runtime?

A The .NET SDK includes the .NET Runtime and tools needed to build and run applications.

B The .NET Runtime includes the SDK and is used only for building applications.

C The SDK and Runtime are completely separate and must be installed independently for any .NET app.

D The SDK is only needed to run applications, while the Runtime is for development.

💡 Hint

Think about what you need to build and run apps versus just running them.

The .NET SDK contains the .NET Runtime plus tools like the compiler and CLI commands. The Runtime alone is only for running apps, not building them.

🔧 Debug

advanced

Diagnosing .NET SDK Not Found Error

You installed the .NET SDK on Windows but running dotnet --version returns 'dotnet: command not found'. What is the most likely cause?

A The .NET SDK installer failed to complete the installation.

B The PATH environment variable does not include the folder where dotnet.exe is installed.

C The .NET Runtime is missing but the SDK is installed correctly.

D The dotnet command requires administrator privileges to run.

💡 Hint

Check if the system knows where to find the dotnet command.

If the PATH variable does not include the SDK install folder, the system cannot find the dotnet command, causing this error.

📝 Syntax

advanced

Correct Command to Install a Specific .NET SDK Version

Which command correctly installs .NET SDK version 6.0.400 using the dotnet-install script on Linux?

A bash dotnet-install.sh --version 6.0.400

B bash install-dotnet.sh -v 6.0.400

C install-dotnet --version=6.0.400

D dotnet-install.sh --install 6.0.400

💡 Hint

The official script uses the --version option with the bash command.

The official dotnet-install script is run with bash and uses the --version option to specify the SDK version.

🚀 Application

expert

Determining Installed .NET SDKs Programmatically

You want to write a C# program that lists all installed .NET SDK versions on the machine. Which approach will reliably get this information?

A Check the <code>Program Files/dotnet/sdk</code> directory for installed SDK folders.

B Read the registry keys under <code>HKEY_LOCAL_MACHINE\SOFTWARE\dotnet\Setup\InstalledVersions</code> on Windows only.

C Use the <code>System.Environment.Version</code> property in C# to get all installed SDK versions.

D Run the command <code>dotnet --list-sdks</code> from the program and parse its output.

💡 Hint

Think about a cross-platform way to get all SDK versions from the official tool.

The dotnet --list-sdks command lists all installed SDK versions on any platform. Running it and parsing output is reliable and cross-platform.

Practice

1. What is the primary purpose of installing the .NET SDK on your computer?

easy

A. To build and run C# programs

B. To browse the internet

C. To edit images

D. To play music files

Solution

1. Step 1: Understand what SDK means

   The .NET SDK contains tools needed to develop and run C# programs.

2. Step 2: Match purpose with options

   Only To build and run C# programs mentions building and running C# programs, which is the SDK's purpose.

3. Final Answer:

   To build and run C# programs -> Option A

4. Quick Check:

   .NET SDK purpose = build and run C# programs [OK]

Hint: SDK is for development tools, not unrelated tasks [OK]

Common Mistakes:

• Confusing SDK with software for browsing or media
• Thinking SDK is only for running, not building
• Assuming SDK is an editor or player

2. Which command correctly checks the installed .NET SDK version in the terminal?

easy

A. dotnet check-version

B. dotnet version

C. dotnet --version

D. dotnet show version

Solution

1. Step 1: Recall the official command

   The official command to check .NET SDK version is dotnet --version.

2. Step 2: Compare with options

   Only dotnet --version matches the exact command syntax.

3. Final Answer:

   dotnet --version -> Option C

4. Quick Check:

   Check version command = dotnet --version [OK]

Hint: Use double dash before version to check SDK version [OK]

Common Mistakes:

• Using single dash or missing dashes
• Adding extra words like 'check' or 'show'
• Confusing with other dotnet commands

3. After installing the .NET SDK, you run these commands:

dotnet new console -o MyApp
cd MyApp
dotnet run

What will be the output?

medium

A. Error: Command not found

B. Hello, World!

C. No output, program does nothing

D. Project creation failed

Solution

1. Step 1: Understand commands run

   dotnet new console -o MyApp creates a new console app named MyApp; cd MyApp moves into that folder; dotnet run runs the app.

2. Step 2: Recall default console app output

   The default console app prints "Hello, World!" when run.

3. Final Answer:

   Hello, World! -> Option B

4. Quick Check:

   dotnet new console output = Hello, World! [OK]

Hint: Default console app prints Hello, World! on run [OK]

Common Mistakes:

• Expecting no output or errors after correct commands
• Confusing project creation with running
• Not changing directory before running

4. You try to run dotnet run but get an error saying no project found. What is the most likely cause?

medium

A. You did not navigate into the project folder

B. The .NET SDK is not installed

C. You typed dotnet run incorrectly

D. Your computer is offline

Solution

1. Step 1: Analyze error message

   Error says no project found, meaning dotnet run can't find a project file in current folder.

2. Step 2: Identify common cause

   This usually happens if you forget to change directory into the project folder after creating it.

3. Final Answer:

   You did not navigate into the project folder -> Option A

4. Quick Check:

   No project found error = wrong folder [OK]

Hint: Always cd into project folder before running dotnet run [OK]

Common Mistakes:

• Assuming SDK is missing without checking
• Blaming internet connection for local build errors
• Ignoring folder navigation step

5. You want to create a new console app named Calculator and run it immediately. Which sequence of commands is correct?

hard

A. dotnet new console Calculator && dotnet run

B. dotnet run Calculator && dotnet new console

C. cd Calculator && dotnet new console && dotnet run

D. dotnet new console -o Calculator && cd Calculator && dotnet run

Solution

1. Step 1: Understand command order

   First create project folder with dotnet new console -o Calculator, then move into it with cd Calculator, then run with dotnet run.

2. Step 2: Check options for correct syntax and order

   Only dotnet new console -o Calculator && cd Calculator && dotnet run has correct order and syntax to create, enter folder, and run.

3. Final Answer:

   dotnet new console -o Calculator && cd Calculator && dotnet run -> Option D

4. Quick Check:

   Create, cd, run sequence = dotnet new console -o Calculator && cd Calculator && dotnet run [OK]

Hint: Create folder, cd in, then run in that folder [OK]

Common Mistakes:

• Running before creating project
• Not changing directory before running
• Using wrong command syntax for project creation