Scenario: You are binding data to a DropDownList in an ASP.NET application, and you want to ensure that the selected item's value is accessible on the server-side during postback. What properties and events should you consider?

Option 1 is the correct approach. By setting the AutoPostBack property of the DropDownList control to true, you ensure that a postback occurs whenever the selection changes. This allows you to handle the SelectedIndexChanged event on the server-side, where you can access the selected item's value using the DropDownList's SelectedValue property. This approach ensures that the selected item's value is available for processing during postback.