Building C# Web and Console Applications: A Hands-On Guide with a Guessing Game

Introduction C# is a versatile programming language widely used for developing various types of applications, including web and console applications. The .NET framework and .NET Core provide robust environments for building scalable, high-performance applications. This guide outlines the steps for creating a C# web application using ASP.NET Core and a C# console application using .NET. As part of this tutorial, we will build a simple Guessing Game for both console and web environments. This will demonstrate how to implement user interaction, logic processing, and UI handling in different application types. 1. Creating a C# Console Application A console application is a simple, lightweight program that runs in a command-line interface. It is typically used for utilities, automation scripts, or testing. Prerequisites Install .NET SDK from Microsoft Use an IDE such as Visual Studio, Visual Studio Code, or JetBrains Rider Steps to Create a Console Application Step 1: Open Command Prompt or Terminal Run the following command to create a new console application: dotnet new console -n MyConsoleApp Step 2: Navigate to the Project Directory cd MyConsoleApp Step 3: Open and Modify Program.cs We will implement a simple guessing game where the user must guess a randomly generated number. using System; class GuessingGame { static void Main() { Random random = new Random(); int numberToGuess = random.Next(1, 101); int userGuess = 0; int attempts = 0; Console.WriteLine("Welcome to the Guessing Game!"); Console.WriteLine("Try to guess the number between 1 and 100."); while (userGuess != numberToGuess) { Console.Write("Enter your guess: "); string input = Console.ReadLine(); // Validate input if (!int.TryParse(input, out userGuess) || userGuess 100) { Console.WriteLine("Invalid input. Please enter a number between 1 and 100."); continue; } attempts++; if (userGuess numberToGuess) Console.WriteLine("Too high! Try again."); else Console.WriteLine($"Congratulations! You guessed it right in {attempts} attempts."); } } } Step 4: Build and Run the Application Before running the modified code, build the application using: dotnet build Then run the application: dotnet run 2 Creating a C# Web Application using ASP.NET Core A web application is a more complex system that runs on a web server and interacts with users through a web browser. Prerequisites Install the latest .NET SDK Install Visual Studio (with ASP.NET and Web Development workload) Basic knowledge of HTML, CSS, and JavaScript Steps to Create a Web Application Step 1: Open Visual Studio and create a new project. dotnet new webapp -n MyWebApp Step 2: Navigate to the Project Directory cd MyWebApp Step 3: Open Program.cs and Modify It We will implement a simple web-based guessing game using ASP.NET Core Razor Pages. using Microsoft.AspNetCore.Builder; using Microsoft.AspNetCore.Http; using Microsoft.Extensions.Hosting; using System; var builder = WebApplication.CreateBuilder(args); var app = builder.Build(); app.UseHttpsRedirection(); // Generate a random number to guess int numberToGuess = new Random().Next(1, 101); int attempts = 0; // Serve the game page and process guesses app.Map("/", async context => { string resultMessage = ""; // This will hold feedback messages // Only process form data if it's a POST request if (context.Request.Method == "POST") { var form = await context.Request.ReadFormAsync(); string guessInput = form["userGuess"]; if (!string.IsNullOrEmpty(guessInput) && int.TryParse(guessInput, out int userGuess)) { attempts++; if (userGuess 100) resultMessage = " Invalid input! Please enter a number between 1 and 100."; else if (userGuess numberToGuess) resultMessage = " Too high! Try again."; else { resultMessage = $" Congratulations! You guessed it right in {attempts} attempts."; numberToGuess = new Random().Next(1, 101); // Reset the game attempts = 0; } } } // HTML structure string html = $@" Guessing Game Welcome to the Web Guessing Game! Guess a number between 1 and 100. Guess {resultMessage} "; context.Response.ContentType = "text/html"; // Ensure correct content type await context.Response.WriteAsync(html); }); a

dotnet new console -n MyConsoleApp

cd MyConsoleApp

using System;

class GuessingGame
{
    static void Main()
    {
        Random random = new Random();
        int numberToGuess = random.Next(1, 101);
        int userGuess = 0;
        int attempts = 0;

        Console.WriteLine("Welcome to the Guessing Game!");
        Console.WriteLine("Try to guess the number between 1 and 100.");

        while (userGuess != numberToGuess)
        {
            Console.Write("Enter your guess: ");
            string input = Console.ReadLine();

            // Validate input
            if (!int.TryParse(input, out userGuess) || userGuess < 1 || userGuess > 100)
            {
                Console.WriteLine("Invalid input. Please enter a number between 1 and 100.");
                continue;
            }

            attempts++;

            if (userGuess < numberToGuess)
                Console.WriteLine("Too low! Try again.");
            else if (userGuess > numberToGuess)
                Console.WriteLine("Too high! Try again.");
            else
                Console.WriteLine($"Congratulations! You guessed it right in {attempts} attempts.");
        }
    }
}

dotnet build

dotnet run

dotnet new webapp -n MyWebApp

cd MyWebApp

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Hosting;
using System;

var builder = WebApplication.CreateBuilder(args);
var app = builder.Build();

app.UseHttpsRedirection();

// Generate a random number to guess
int numberToGuess = new Random().Next(1, 101);
int attempts = 0;

// Serve the game page and process guesses
app.Map("/", async context =>
{
    string resultMessage = ""; // This will hold feedback messages

    // Only process form data if it's a POST request
    if (context.Request.Method == "POST")
    {
        var form = await context.Request.ReadFormAsync();
        string guessInput = form["userGuess"];

        if (!string.IsNullOrEmpty(guessInput) && int.TryParse(guessInput, out int userGuess))
        {
            attempts++;

            if (userGuess < 1 || userGuess > 100)
                resultMessage = "
 Invalid input! Please enter a number between 1 and 100.";
            else if (userGuess < numberToGuess)
                resultMessage = "
 Too low! Try again.";
            else if (userGuess > numberToGuess)
                resultMessage = "
 Too high! Try again.";
            else
            {
                resultMessage = $"
 Congratulations! You guessed it right in {attempts} attempts.";
                numberToGuess = new Random().Next(1, 101); // Reset the game
                attempts = 0;
            }
        }
    }

    // HTML structure
    string html = $@"
    
    
        
    
    
        
Welcome to the Web Guessing Game!
        
Guess a number between 1 and 100.

        

            
            Guess
        


        {resultMessage} 
    
    ";

    context.Response.ContentType = "text/html"; // Ensure correct content type
    await context.Response.WriteAsync(html);
});

app.Run();

dotnet build

dotnet run

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