Disable ALT+TAB in ASP.NET

hi,

i am the part of developing "Online Quiz".
i have an issue with my application.
i wanted to restrict the user to see only my page until finishes the quiz.
means that i wanted to disable of opening other pages such as ALT+TAB, CTRL+T.
my application is developing in ASP.NET, C#.

any suggestions regarding this please welcome.

thanks in advance...

You can not control client computer using ASP.NET. It is a server side technology. Which executes on the server. But you can control some events on the client using JavaScript,Like Disable right click.