<Window x:Class="WpfApplication1.Window1" Title="Resources" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:s="clr-namespace:System;assembly=mscorlib"> <Window.Resources> <SolidColorBrush x:Key="myBrush" Color="Green" /> <s:String x:Key="HW">Hello, world</s:String> </Window.Resources> <Grid x:Name="myGrid"> </Grid> </Window>