Hi,
That Clipboard class resides in System.Windows.Forms. You cannot use this in ASP.net, because it will only attempt to modify the clipboard state of the server the ASP.net process runs on. And that's probably not what you're looking for.
To modify the clipboard from a website, you need to look at unreliable Javascript solutions. Please note that the clipboard is potentially unsafe and possible can't be accessed at all.
Javascript
-- To Set
window.clipboardData.setData('key','Value');
-- To Get
window.clipboardData.getData('key');
I hope this will help you out.