John works as a Web Developer for ProMetaworks Inc. He creates an ASP.NET application, named MyApp1, by using Visual Studio .NET. MyApp1 contains a page, named Page1. Page1 contains several TextBox controls that accept users' input. John uses several validation controls on the page to validate input controls. He wants to display all the validation error messages on the page in a message box. However, he does not want the validation summary to be displayed inline on the Web page. What will he do to accomplish the task?