USER AGENT Switcher Design

I am using Watin I want to select different USER Agent before l开发者_JAVA技巧aunching IE so that it emulates and behaves like user string entered or selected.or in other words i like to implement same as http://www.howtogeek.com/howto/18450/change-the-user-agent-string-in-internet-explorer-8/ but in c# not in IE