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using and namespace

Learn the using directive and the namespace concept.

The namespace Concept

In C#, namespaces (namespace) are used to group related classes into a logical collection and prevent naming conflicts. In large projects or libraries, two classes might share the same name. Using namespaces, we place classes under their own dedicated packages to distinguish them.

namespace OyunSistemi
{
    public class Dusman { }
}

All core game classes provided by Unity reside inside the UnityEngine namespace.

The using Directive

To use classes from a namespace without typing their full paths every time, the using directive is added at the very top of the file. For example, when you write using UnityEngine;, you can type GameObject instead of UnityEngine.GameObject. For standard C# libraries, using System; is included.

using System;
using UnityEngine;

public class Karakter : MonoBehaviour
{
}

Missing using directives cause compiler errors because the compiler cannot locate the referenced classes.

Practice Include namespace with using

At the top of the file, write the using directive to include the System namespace. Inside the Main method, print "using System basarili!" using Console.WriteLine.

Starter code

Player.cs
// System ad alanini dahil et

public class Program
{
    public static void Main()
    {
        // Console.WriteLine ile mesaj yazdir
    }
}

Sample solution

Player.cs
using System;

public class Program
{
    public static void Main()
    {
        Console.WriteLine("using System basarili!");
    }
}

Expected output

using System basarili!

Questions and answers

Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.

1 What is the primary purpose of using a namespace in C#?

  • To logically group classes and avoid name collisions Correct answer
  • To speed up lighting calculations in the scene
  • To allow code to run directly without compilation
  • To automatically set the game's screen resolution

Explanation: Namespaces categorize classes and prevent identically named classes across different libraries from colliding.

2 Importing Unity namespace

Question 
using ____;
Answer 
using UnityEngine;

Explanation: The UnityEngine namespace is imported to use the core classes of the Unity engine and the MonoBehaviour structure.

3 using and namespace matching

Term Meaning
using Adds the specified namespace to the file
namespace Namespace block that groups classes
UnityEngine Namespace with Unity engine classes
System Namespace with standard C# libraries

All lessons in Beginner

1 What is game development?

  1. Intro to game development
  2. Game engines
  3. 2D and 3D games
  4. The game loop
  5. The scene concept
  6. Summary - Game dev fundamentals

2 Unity setup

  1. Installing Unity Hub
  2. Creating your first project
  3. The editor interface
  4. Toolbar and playback
  5. Saving the project
  6. Summary - Unity setup

3 First scene project

  1. Project overview
  2. Camera and light
  3. Your first cube in the scene
  4. Adding a material
  5. Testing in Play mode
  6. Summary - First scene

4 The GameObject concept

  1. What is a GameObject?
  2. Components
  3. The Hierarchy window
  4. Editing with the Inspector
  5. Tags and Layers
  6. Summary - GameObject

5 C# script basics

  1. Your first C# script
  2. using and namespace
  3. Class structure
  4. Variables and types
  5. Output with Debug.Log
  6. Summary - C# basics

6 MonoBehaviour

  1. What is MonoBehaviour?
  2. The Start method
  3. The Update method
  4. Awake vs Start
  5. SerializeField and public
  6. Summary - MonoBehaviour

7 Transform

  1. What is Transform?
  2. Changing position
  3. Moving with Translate
  4. Changing rotation
  5. Local vs world space
  6. Summary - Transform

8 Input

  1. The Input class
  2. Axis input
  3. Mouse input
  4. The new Input System
  5. Movement vector
  6. Summary - Input

9 Physics (Rigidbody/Collider)

  1. What is a Rigidbody?
  2. What is a Collider?
  3. Applying force with AddForce
  4. Collision events
  5. Trigger events
  6. Summary - Physics

10 2D Sprite

  1. What is a Sprite?
  2. SpriteRenderer
  3. Sprite import settings
  4. Sprite sorting
  5. Preparing sprite animation
  6. Summary - 2D Sprite

11 Godot basics

  1. The Godot editor
  2. A new project
  3. The scene tree
  4. The Node concept
  5. Saving the project
  6. Summary - Godot basics

12 GDScript

  1. What is GDScript?
  2. extends and variables
  3. Function definition
  4. Output with print
  5. Type hints
  6. Summary - GDScript

13 Node and Scene

  1. Node2D and Sprite2D
  2. Saving a scene
  3. Scene instance
  4. The _ready method
  5. The _process method
  6. Summary - Node and Scene

14 Beginner final

  1. Challenge 1: Print a score
  2. Challenge 2: Movement vector
  3. Challenge 3: Godot ready
  4. Challenge 4: Collision log
  5. Challenge 5: Final synthesis