If you want to change your page theme, use RequestTheme property in App.Xaml file. Basically theme is designed for better look. Bydefault, our windows store app uses dark theme. The System resource also included a light theme.
In Solution Explorer, double click App.xaml to open it.
In the opening Application tag, add the RequestedTheme property with its value set to Light.
App.xaml file
<Application
x:Class="App4.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:App4" RequestedTheme="Light">
</Application>
Your background theme will be changed after set property.
In Solution Explorer, double click App.xaml to open it.
In the opening Application tag, add the RequestedTheme property with its value set to Light.
App.xaml file
<Application
x:Class="App4.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:App4" RequestedTheme="Light">
</Application>
Lets see after set the property
