How to create a Simple console-based To-Do List App

I'll show you how using a basic C# and .NET console-based to-do list application. In this example, tasks will be stored in a simple text file. Together, we will develop a console application that enables task addition, viewing, and removal.

1. Open Visual Studio or any text editor you prefer.
2. Create a new Console App project in C#.

using System;
using System.Collections.Generic;
using System.IO;

class Program
{
    static string filePath = "todo.txt";

    static void Main()
    {
        Console.WriteLine("Simple To-Do List App");
        Console.WriteLine("---------------------");

        while (true)
        {
            Console.WriteLine("1. View tasks");
            Console.WriteLine("2. Add task");
            Console.WriteLine("3. Remove task");
            Console.WriteLine("4. Exit");

            Console.Write("Enter your choice (1-4): ");
            string choice = Console.ReadLine();
switch (choice)
            {
                case "1":
                    ViewTasks();
                    break;

                case "2":
                    AddTask();
                    break;

                case "3":
                    RemoveTask();
                    break;

                case "4":
                    Environment.Exit(0);
                    break;

                default:
                    Console.WriteLine("Invalid choice. Please enter a number between 1 and 4.");
                    break;
            }
        }
    }
static void ViewTasks()
    {
        Console.WriteLine("\nTasks:");

        if (File.Exists(filePath))
        {
            string[] tasks = File.ReadAllLines(filePath);

            for (int i = 0; i < tasks.Length; i++)
            {
                Console.WriteLine($"{i + 1}. {tasks[i]}");
            }
        }
        else
        {
            Console.WriteLine("No tasks available.");
        }

        Console.WriteLine();
    }

    static void AddTask()
{
        Console.Write("\nEnter the task: ");
        string task = Console.ReadLine();

        using (StreamWriter writer = File.AppendText(filePath))
        {
            writer.WriteLine(task);
        }

        Console.WriteLine("Task added successfully.\n");
    }

    static void RemoveTask()
    {
        ViewTasks();

        Console.Write("Enter the task number to remove: ");
        if (int.TryParse(Console.ReadLine(), out int taskNumber))
        {
            List<string> tasks = new List<string>(File.ReadAllLines(filePath));

            if (taskNumber > 0 && taskNumber <= tasks.Count)
            {
                string removedTask = tasks[taskNumber - 1];
 tasks.RemoveAt(taskNumber - 1);

                File.WriteAllLines(filePath, tasks.ToArray());

                Console.WriteLine($"Task '{removedTask}' removed successfully.\n");
            }
            else
            {
                Console.WriteLine("Invalid task number.\n");
            }
        }
        else
        {
            Console.WriteLine("Invalid input. Please enter a valid number.\n");
        }
    }
}         

To store tasks, this application uses a simple text file called todo.txt. If necessary, you can change this code to use a database or another type of storage. After the software has been compiled and ran, the console will display a simple to-do list application.

.........................Thank You .!!..