LightBox.NET is the packaging of Lightbox JS v2.0 project developed by Lokesh Dhakar into a .NET assembly along with two simple web controls to provide the “lightbox” support.
The first web control, ScriptManager, is used to install the necessary script, image and CSS files into your ASP.NET application and to add the correct HTML elements to your element.
If you want to use LightBox.NET in your page, you need to place a ScriptManager control in it.