Windows Phone : How to set Startup/Default page

Issue: How to set Startup / Default page in Windows Phone 7/8 app.

Solution:
Open WMAppManifest.xml file in Properties folder.
Set the proper Page name for the Tasks/DefaultTask/NavigationPage attribute as below:

<Tasks>
      <DefaultTask  Name ="_default" NavigationPage="Page1.xaml"/>
</Tasks>