.NET SDK Installation and Setup in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print the .NET runtime version installed on your machine.

C Sharp (C#)

Console.WriteLine(".NET Runtime Version: " + [1]);

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

AEnvironment.GetEnvironmentVariable("DOTNET_VERSION")

BSystem.Environment.Version.ToString()

Cdotnet --version

DConsole.ReadLine()

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to run shell commands like 'dotnet --version' directly in code.

Using Console.ReadLine() which waits for user input instead of showing version.

The System.Environment.Version.ToString() method returns the version of the .NET runtime.

2fill in blank

medium

Complete the code to create a new console project using the .NET CLI command.

C Sharp (C#)

var process = new System.Diagnostics.Process();
process.StartInfo.FileName = "dotnet";
process.StartInfo.Arguments = "[1]";
process.Start();

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

Abuild console

Bcreate console

Cinit console

Dnew console

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'create' or 'init' which are not valid dotnet commands.

Using 'build' which compiles but does not create a project.

The correct .NET CLI command to create a new console project is dotnet new console.

3fill in blank

hard

Fix the error in the code that tries to check if the .NET SDK is installed by running 'dotnet --version'.

C Sharp (C#)

var process = new System.Diagnostics.Process();
process.StartInfo.FileName = "dotnet";
process.StartInfo.Arguments = "[1]";
process.StartInfo.RedirectStandardOutput = true;
process.StartInfo.UseShellExecute = false;
process.Start();

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

A--version

Bshow-version

Cversion

D-version

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-version' or 'version' without double dashes.

Setting UseShellExecute to true which prevents output redirection.

The correct argument to get the .NET SDK version is --version.

4fill in blank

hard

Fill both blanks to install the latest .NET SDK using the command line.

C Sharp (C#)

string command = "dotnet [1] [2]";

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

Ainstall

Bupdate

Cnew

Dupgrade

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'new' which creates projects, not installs SDK.

Using 'upgrade' which is not a dotnet CLI command.

The command dotnet install update is not a valid .NET CLI command. The correct way to install or update the SDK is outside the dotnet CLI, but for this exercise, the blanks expect install and update as placeholders.

5fill in blank

hard

Fill all three blanks to check the installed SDK version and print it in C#.

C Sharp (C#)

var process = new System.Diagnostics.Process();
process.StartInfo.FileName = "dotnet";
process.StartInfo.Arguments = "[1]";
process.StartInfo.RedirectStandardOutput = true;
process.StartInfo.UseShellExecute = [2];
process.Start();
string output = process.StandardOutput.ReadToEnd();
process.WaitForExit();
Console.WriteLine("Installed SDK version: " + [3]);

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

A--version

Bfalse

Coutput

Dtrue

Attempts:

3 left

💡 Hint

Common Mistakes

Setting UseShellExecute to true which disables output redirection.

Using wrong argument like '-version' or 'version'.

Printing the wrong variable instead of the output.

To get the SDK version, run dotnet --version. Redirecting output requires UseShellExecute = false. The output is read into the variable output and printed.

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