Creating Dynamic Web Applications

1. Introduction

Brief explanation of the tutorial's goal

This tutorial aims to guide you through the process of creating dynamic web applications using ASP.NET.

What the user will learn

By the end of this tutorial, you will learn how to:
- Use models and views in ASP.NET
- Handle user inputs
- Create dynamic web pages

Prerequisites

Before you begin, it would be helpful if you:
- Have a basic understanding of C# programming language
- Are familiar with HTML and CSS

2. Step-by-Step Guide

Understanding Models and Views

In ASP.NET, a model holds the data and business logic. It's a class that represents the data in your application. A View, on the other hand, is an HTML template with embedded Razor markup.

public class Product
{
    public int ID { get; set; }
    public string Name { get; set; }
    public decimal Price { get; set; }
}

This is an example of a Model class named Product with properties ID, Name, Price.

Handling User Input

In ASP.NET, we use Controllers to handle user input. Controllers are responsible for handling user input and responses. They contain actions that respond to URL requests.

public class ProductsController : Controller
{
    [HttpGet]
    public ActionResult Create()
    {
        return View();
    }

    [HttpPost]
    public ActionResult Create(Product product)
    {
        // Save product to database
    }
}

This example shows a ProductsController with two Create actions. The HttpGet action displays the form, and the HttpPost action handles the form submission.

3. Code Examples

Creating a Model

public class Employee
{
    public int EmployeeId { get; set; }
    public string Name { get; set; }
    public string Department { get; set; }
}

In this code snippet, we create a simple Employee model with EmployeeId, Name, and Department properties.

Creating a View

@model Employee
<form asp-action="Create">
    <input asp-for="Name" type="text" />
    <input asp-for="Department" type="text" />
    <button type="submit">Create</button>
</form>

This code snippet shows a view for creating an employee. The asp-action tag helper sets the form's action to the Create action in the controller.

4. Summary

In this tutorial, we covered how to create dynamic web applications using ASP.NET. You've learned how to use models and views, handle user input, and create dynamic web pages.

To continue learning, you can explore more about ASP.NET and its various features like Authentication, Routing, and Entity Framework.

5. Practice Exercises

1. Create a model Student with properties StudentId, Name, and Grade.
2. Create a view that allows user to enter Name and Grade.
3. Create a controller StudentsController with actions to handle user input.

Solutions:
1. Student Model

public class Student
{
    public int StudentId { get; set; }
    public string Name { get; set; }
    public string Grade { get; set; }
}

1. Student View

@model Student
<form asp-action="Create">
    <input asp-for="Name" type="text" />
    <input asp-for="Grade" type="text" />
    <button type="submit">Create</button>
</form>

1. Student Controller

public class StudentsController : Controller
{
    [HttpGet]
    public ActionResult Create()
    {
        return View();
    }

    [HttpPost]
    public ActionResult Create(Student student)
    {
        // Save student to database
    }
}

Keep practicing and exploring more about ASP.NET. Happy coding!