VS Code — Complete .NET Setup Guide

What is VS Code?

Visual Studio Code (VS Code) is a free, lightweight, open-source code editor built by Microsoft. Unlike Visual Studio (the full IDE), VS Code is a fast, minimal editor extended with plugins — making it highly customizable for any language or platform including C# and .NET.

Why Use VS Code?

VS Code launches in under 2 seconds, runs on Windows, Mac, and Linux, and uses far less RAM than Visual Studio. It is the most popular code editor in the world (Stack Overflow survey, 7 years running).

Where is it Used?

Scenario	Use
ASP.NET Core Web API development	✅ With C# Dev Kit
Microservices and Docker	✅ Lightweight, fast
Linux/Mac development	✅ Cross-platform
Frontend (Angular/React) + Backend	✅ One editor for both
Remote development (SSH)	✅ Remote extensions

Key Benefits

• Fast — opens instantly, even large projects
• Free & open source — no license cost
• Cross-platform — same experience on Windows, Mac, Linux
• Huge extension library — 50,000+ extensions for any tool or language
• Built-in terminal — run dotnet commands without switching windows
• REST Client extension — test APIs directly inside VS Code
• Git integration — stage, commit, push from the sidebar

VS Code is great for .NET APIs, microservices, and cross-platform development.

Install VS Code

Download: code.visualstudio.com

Essential Extensions

Extension	Purpose	Install
C# Dev Kit	IntelliSense, project mgmt, test explorer	Required
.NET Install Tool	Manage .NET SDK versions	Required
GitLens	Git blame, history, annotations	Strongly recommended
REST Client	Test HTTP APIs inside VS Code	Recommended
Thunder Client	Postman-like GUI inside VS Code	Recommended
SQL Server (mssql)	Connect to SQL Server, run queries	Recommended
Error Lens	Show errors inline next to code	Recommended
Bracket Pair Colorizer	Color-matched brackets	Nice to have

Install C# Dev Kit: Ctrl+Shift+X → search "C# Dev Kit" → Install

⌨️ Essential Keyboard Shortcuts

File and Navigation

Shortcut	Action
Ctrl+P	Quick open file
Ctrl+Shift+P	Command palette
Ctrl+Tab	Switch between open files
Ctrl+G	Go to line number
F12	Go to definition
Alt+F12	Peek definition
Shift+F12	Find all references
Ctrl+Shift+F	Search across all files
Ctrl+B	Toggle sidebar

Code Editing

Shortcut	Action
Ctrl+.	Quick fix / suggestions
F2	Rename symbol (refactor)
Alt+Shift+F	Format document
Ctrl+/	Toggle line comment
Ctrl+Shift+/	Toggle block comment
Alt+Up/Down	Move line up/down
Shift+Alt+Up/Down	Copy line up/down
Ctrl+D	Select next occurrence
Ctrl+Shift+L	Select all occurrences
Ctrl+L	Select entire line
Ctrl+X	Cut line (no selection = cut whole line)

Terminal and Running

Shortcut	Action
Ctrl+`` ``	Toggle integrated terminal
Ctrl+Shift+`` ``	New terminal
F5	Start debugging
Shift+F5	Stop debugging
Ctrl+Shift+B	Run build task
F9	Toggle breakpoint
F10	Step over
F11	Step into

Multi-cursor (Power Feature)

Shortcut	Action
Alt+Click	Add cursor at click position
Ctrl+Alt+Down	Add cursor below
Ctrl+Alt+Up	Add cursor above
Ctrl+Shift+Alt+Arrow	Column/box selection

settings.json

Ctrl+Shift+P → "Open User Settings (JSON)":

{
  "editor.fontSize": 14,
  "editor.fontFamily": "'JetBrains Mono', 'Cascadia Code', Consolas, monospace",
  "editor.fontLigatures": true,
  "editor.formatOnSave": true,
  "editor.tabSize": 4,
  "editor.rulers": [120],
  "editor.bracketPairColorization.enabled": true,
  "editor.minimap.enabled": false,
  "files.autoSave": "afterDelay",
  "files.autoSaveDelay": 1000,
  "terminal.integrated.defaultProfile.windows": "PowerShell",
  "editor.stickyScroll.enabled": true,
  "[csharp]": {
    "editor.defaultFormatter": "ms-dotnettools.csharp"
  }
}

Debugging in VS Code

Create .vscode/launch.json:

{
  "version": "0.2.0",
  "configurations": [
    {
      "name": "Launch SchoolManagement API",
      "type": "dotnet",
      "request": "launch",
      "projectPath": "${workspaceFolder}/SchoolManagementApi.csproj",
      "env": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    }
  ]
}

REST Client Extension — Test APIs Without Postman

Create api-tests.http:

@baseUrl = http://localhost:5001
@token   = eyJhbGciOiJIUz...

### Login
POST {{baseUrl}}/api/auth/login
Content-Type: application/json

{
  "email": "admin@nexcoding.in",
  "password": "Admin@123"
}

### Get all students
GET {{baseUrl}}/api/students
Authorization: Bearer {{token}}

### Enroll student
POST {{baseUrl}}/api/students
Content-Type: application/json
Authorization: Bearer {{token}}

{
  "name": "Ravi Kumar",
  "className": "10th"
}

Click Send Request above each block → response appears in split panel.

VS Code Interview Questions

Q1: What is C# Dev Kit and why is it needed?

C# Dev Kit is the official Microsoft extension for C# in VS Code.
Provides IntelliSense, debugging, test explorer, Solution Explorer.
Without it, VS Code has no understanding of C# code.

Q2: How do you debug a .NET app in VS Code?

1. Create .vscode/launch.json (or let C# Dev Kit generate it)
2. Set breakpoints (F9)
3. Press F5 to start debugging
4. Use F10/F11 to step through code

Q3: VS Code vs Visual Studio — when to use which?

VS Code   → APIs, microservices, Linux/Mac, lightweight, cross-platform
Visual Studio → Full .NET apps, WPF/WinForms, Designer tools, deeper debugging

🤖Use AI to Learn Faster

Use ChatGPT, Claude, or Copilot to go deeper on VS Code setup for .NET C# development. Try these prompts:

• "What is the most important VS Code extension for C# development and what does it do?"
• "How do I use the REST Client extension to test my API?"
• "What VS Code shortcuts should every C# developer memorize?"
• "How do I set up debugging for an ASP.NET Core project in VS Code?"

💡 Tip: After reading this article, paste your own code into AI and ask "What could go wrong here and why?" — fastest way to find edge cases and deepen understanding.