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Windows Phone 7 Silverlight Cookbook
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In this recipe, we will implement the most fundamental use of location services, tracking latitude and longitude. Our sample application will be a navigation helper which displays all the available location information. We will also review the different ways in which the phone gets its location information and their attributes.
We will be working in Visual Studio for this tutorial, so start by opening Studio and creating a new Windows Phone 7 application using the Windows Phone Application project template.
All the location/GPS-related methods and classes are found in the System.Device assembly, so add this reference next:

We will need some UI to start tracking and displaying the data, so go to the MainPage.xaml file, if it's not already open. Change the ContentPanel from a Grid to a StackPanel, then add a button to the designer, and set its Content property to Start Tracking. Next add four TextBlocks. Two of these will be Latitude and Longitude...
Change the font size
Change margin width
Change background colour