How to make Toolbars work in .NET w/c#.....

I've downloaded Microsoft.Web.UI.Webcontrols.dll and installed it. I'm having a heck of a time being able to put some code behind the buttons i create. Does anybody have any code examples that could help me out. A simple "Hello World" that pops up when the button is clicked would be all i need. I'd need to see the whole file for formatting/using/inclusion examples. thank you.