How to change pictures in asp net to combo box selected index change


ASP.NET is a popular programming language used for web applications. One requirement in web development is to change pictures based on the index of a combo box. In this article, we will explore how to achieve this functionality using ASP.NET.

Step 1: Setting up the HTML Markup

, let's set up the HTML markup for the combo box and the container. We will use the tag for the combo box and the tag for the image container. Here's an example:

In the above code, we have defined a combo box with three options and an image container with an initial image.

Step 2: Implementing the JavaScript Function

To change the image based on the selected index of the combo box, we need to implement a JavaScript function. This function will be called whenever the combo box selection . Here's an example:

In the above code, we retrieve the combo box and image container using their respective IDs. We then get the value of the selected option from the combo box and set it as the source of the image container.

Step 3: Testing the Functionality

Now that we have set up the HTML markup and implemented the JavaScript function, let's test the functionality. Run the ASP.NET application and try changing the combo box selection. You should see the image in the image container change accordingly.

By following the above steps, you can easily change pictures in ASP.NET based on the selected index of a combo box. This functionality can be useful in various scenarios, such as displaying different product images based on the selected category or showing different user avatars based on the selected theme.


ASP.NET provides a powerful for developing web applications. By leveraging JavaScript and HTML, we can easily implement functionalities like changing pictures based on combo box selection. With the example provided in this article, you should be able to incorporate this functionality into your ASP.NET projects.

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