# Apply themes with App.xaml
`App.xaml`
```xml
```
# Change themes by ThemeManager
Change by static property
```c#
ThemeManager.CurrentTheme = ColorThemes.Classic;
```
# Change themes by ResourceDictionary
Also you can change theme by adding resource dictionary after generic.xaml. Use one of them:
```xml
or
or
or
```
## NOTE
It is recommended use `Background="{DynamicResource WindowBackgroundBrush}"` for Window markup