ASP.NET Web Page Classes:

In ASP.NET, web page classes are C# or VB.NET classes that define the code-behind logic for individual web pages. These classes contain the server-side code that handles events, processes user input, interacts with data, and controls the behavior of the web page. Let's break it down with an example:

Example: Using a Web Page Class

Suppose you have a web page that allows users to enter their name and then displays a personalized greeting. Here's how you can create a web page class for this scenario:

1. Create the ASP.NET Web Page:

   • In Visual Studio, create a new ASP.NET Web Application project.
   • Add a new web form to your project (e.g., "GreetingPage.aspx").
   • Design your web form with a TextBox for entering the name, a Button for submitting the name, and a Label for displaying the greeting.

2. Define the Code-Behind Class:

   • Find the code-behind file for your web form (e.g., "GreetingPage.aspx.cs").
   • Define a class that inherits from System.Web.UI.Page. This class will contain the server-side logic for your web page.

Example

using System;
using System.Web.UI;

public partial class GreetingPage : Page
{
protected void Page_Load(object sender, EventArgs e)
{
// Code that executes when the page loads
}

protected void btnSubmit_Click(object sender, EventArgs e)
{
// Code that executes when the submit button is clicked
string name = txtName.Text;
lblGreeting.Text = "Hello, " + name + "!";
}
}

3. Add Event Handlers:

   • Inside the code-behind class, define event handler methods for any server-side events you want to handle. For example, Page_Load executes when the page loads, and btnSubmit_Click executes when the submit button is clicked.

4. Connect the Web Form and Code-Behind Class:

   • In the markup of your web form (GreetingPage.aspx), specify the code-behind class using the Inherits attribute.

Example

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="GreetingPage.aspx.cs" Inherits="YourNamespace.GreetingPage" %>

5. Test Your Web Page:

   • Run your ASP.NET web application, and navigate to the GreetingPage.aspx page.
   • Enter a name in the TextBox and click the submit button.
   • You should see a personalized greeting displayed in the Label.

That's it! You've created a web page class in ASP.NET that handles events and controls the behavior of your web page. This class encapsulates the server-side logic, making your code organized and maintainable.