Just about any page needs some sort of informational display, whether it's to display errors or informational messages. The ErrorDisplay control provides a simple way to display an informational display box anywhere in your page and display errors or messages with a single line of code easily.
Sometimes inline messages aren't possible because you simply don't have enough data to display the page or the context of the page has disappeared.For example, when you click a delete button on an item and that item no longer exists. Often you'd want to display just a message that the delete worked or that an error occured. This example displays a page and then returns to this page after 8 seconds.
Enter a Header:
Enter a Message to display: This message text becomes the body of the page that is displayed.