Adding a dynamic control to a placeholder control and wire up the event.

From Kris'Blog

Most controls are just drag & dropped on a webform or handcoded by a developer in the source view of the document. Although these controls can display dynamic data, for example coming from a database, the controls on the webform themselves remain static. In some scenario's however you want dynamically added controls. For example if a certain authenticated user views the page you want to show more information, or depending on a certain choice you want to load a Repeater control with data or a DateTime control. In this article I instantiate a RadioButtonList control, add it to a PlaceHolder control and wire up the SelectedIndexChanged event of the RadioButtonList instance. Listing 1 shows the C# version and Listing 2 the VB.NET version. Either version is equivalent and it's quite easy to compare both of the code snippets since both have the same equivalent code on the same line.