Q:

System. Windows. Browser in Windows Phone

I'm trying to open a webpage in a Silverlight App for Windows Phone 7. 
Is there a way to open Internet Explorer? 

A:

You'll need to use the WebBrowser Task to open a WebPage in Internet Explorer. 
Add the following using statement:  
using Microsoft. Phone. Tasks;
Then you can use the Task in a function such as below:
WebBrowserTask task = new WebBrowserTask();
task. URL = "http://www.stackoverflow.com";
task. Show();
Hope this helps!