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By David Li on Friday, 14 December 2024

Creating Web Applications with ASP.NET

Introduction to Creating Web Applications with ASP.NET

ASP.NET is a web development framework created by Microsoft that allows developers to build dynamic web applications. With ASP.NET, developers can create web applications that can be accessed from any device with a web browser, such as desktop computers, laptops, tablets, and smartphones.

ASP.NET provides developers with a set of tools and technologies for building web applications, including web forms, MVC (Model-View-Controller) architecture, and Web API (Application Programming Interface). These technologies allow developers to create web applications with rich user interfaces, complex business logic, and seamless integration with other systems.

Creating a New Project Once your development environment is set up, you can create a new ASP.NET project. In Visual Studio, select File > New > Project... from the main menu.

In the New Project dialog box that appears, select ASP.NET Core Web Application from the list of templates on the left side of the window. Then click Next.

On the next screen, enter a name for your project and choose a location where it will be saved. Then click Create.

You’ll now be prompted to choose a template for your new project. For this example, we’ll use the Web Application (Model-View-Controller) template. Select this option and then click Create.

Visual Studio will now create a new ASP.NET project for you based on the selected template.

Adding Basic Functionality Now that you have a new project created, let’s add some basic functionality to it.

First, open the HomeController.cs file in your project (you can find it in the Controllers folder). This file contains code for handling requests to your application’s home page.

Let’s add a simple action method that returns some text when called:

public IActionResult HelloWorld()
{
    return Content("Hello World!");
}

This code defines an action method named HelloWorld. When called (by sending an HTTP request to /Home/HelloWorld), it returns some plain text content (“Hello World!”).

Next, let’s add a link to our new action method on our home page so users can easily access it.

Open the Index.cshtml file in your project (you can find it in the Views/Home folder). This file contains the HTML code for your application’s home page.

Add a new link to our HelloWorld action method by adding the following code inside the

element with the class text-center:

<a asp-controller="Home" asp-action="HelloWorld">Say Hello</a>

This code uses ASP.NET’s tag helper syntax to generate a link to our new action method. When clicked, it will send an HTTP request to /Home/HelloWorld, which will call our HelloWorld action method and display its result.

Save your changes and run your application (press F5 or select Debug > Start Debugging from the main menu). You should now see a new “Say Hello” link on your home page. Click it to see the "Hello World!" message.

!aspnet

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