You work as a Web Application Developer for SunInfo Inc.

You work as a Web Application Developer for SunInfo Inc. The company uses Visual Studio 2008 as its application development platform. You create a Web application using .NET Framework 3.5. Your application has a form that accepts a user name and email address. You want to validate the input text for the email address by matching against a pattern defined in the regular expression.

Which of the following validation controls will you use to accomplish the task?