ToDoList

A simple To-Do list console application built in C# (.NET) as part of my internship.
This project demonstrates task modeling, data persistence with JSON, and a custom Heap data structure for task prioritization.

---

📌 Overview

The app allows you to manage tasks (add, update, delete, mark complete) while practicing core software engineering concepts:

• OOP principles (classes, interfaces, encapsulation)
• Generics & Data Structures (Heap implementation)
• LINQ extensions for easier query building
• JSON file I/O for persistence
• Clean, layered code organization

---

✨ Key Features

• CRUD operations on tasks
• Mark tasks as complete / incomplete
• Prioritization: compare tasks by deadline → priority → creation date
• Data stored in JSON file (tasksss.json)
• Generic Heap with custom IComparer<T> (max-heap or min-heap)
• Extension method ToHeap() to build a heap from any sequence

---

🏗️ Project Structure

ToDoList/
├─ ToDoList.sln
├─ ToDoList/
│  ├─ Program.cs              # Entry point with test methods
│  ├─ tasksss.json            # Sample task data
│  ├─ Data/
│  │  ├─ IFileReader.cs       # File reading interface
│  │  └─ JsonFileReader.cs    # JSON implementation
│  └─ Models/
│     ├─ Task.cs              # Task entity with CompareTo
│     ├─ TheList.cs           # Wrapper around list of tasks
│     ├─ Enums/Priority.cs    # Priority levels
│     ├─ DataStructures/Heap.cs
│     └─ Extension/LinqExtension.cs

---

🚀 Getting Started

Prerequisites

• .NET SDK (6.0+ recommended)
• Visual Studio or VS Code

Run

1. Clone this repo:

   git clone https://github.com/asAlwaysZahra/ToDoList.git

2. Open solution in Visual Studio

3. Build & run the ToDoList project

4. Ensure tasksss.json is in the output directory (or adjust path in Program.cs)

---

🔮 Learning Outcomes

This project was created during my internship to strengthen:

• C# and .NET fundamentals
• Data structures (Heap) and algorithms
• JSON serialization/deserialization
• Clean code and project structuring