Style trong lập trình WPF

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace Style___WPF
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
    }
}
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<Window x:Class="Style___WPF.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    <Window.Resources>
        <ResourceDictionary Source="StyleResource.xaml"></ResourceDictionary>
        
    </Window.Resources>
    <StackPanel>
        <Grid>
            <Grid.Resources>
                <Style TargetType="Button">
                    <Setter Property="Width" Value="150"></Setter>
                    <Setter Property="Background" Value="Aqua"></Setter>
                </Style>
                <Style TargetType="TextBox">
                    <Setter Property="Width" Value="150"></Setter>
                    <Setter Property="Background" Value="Aqua"></Setter>
                </Style>
                
            </Grid.Resources>
            <Button Content="HowKteam.com" HorizontalAlignment="Left">
            </Button>
            <Button Content="HowKteam.com" HorizontalAlignment="Right">
            </Button>
            <TextBox Width="100"></TextBox>
        </Grid>     
        <StackPanel>
            <StackPanel.Resources>
                <Style TargetType="Button" x:Key="btnStylePurple">
                    <Setter Property="Width" Value="150"></Setter>
                    <Setter Property="Background" Value="Purple"></Setter>
                </Style>
                <Style TargetType="Button" x:Key="btnStyleOrange">
                    <Setter Property="Width" Value="150"></Setter>
                    <Setter Property="Background" Value="Orange"></Setter>
                </Style>
            </StackPanel.Resources>
            <Button Content="Free Education" Style="{StaticResource btnStylePurple}">
            </Button>
            <Button Content="Free Education" Style="{StaticResource btnStyleOrange}">
            </Button>
        </StackPanel>
        <StackPanel>
            <Button Content="Share to be better"></Button>
            <TextBox Text="K9">
                <TextBox.Background>
                    <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                        <GradientStop Color="Black" Offset="0"/>
                        <GradientStop Color="#FFA5EA2E" Offset="0.648"/>
                    </LinearGradientBrush>
                </TextBox.Background>

            </TextBox>
        </StackPanel>
        <StackPanel>
            <Button Content="Mushi" Background="{StaticResource colorGardien}" Style="{StaticResource ResourceKey=btnStyleFrom_ResourceFile}">               
            </Button>
        </StackPanel>
    </StackPanel>
</Window>
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<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <Style TargetType="Button" x:Key="btnStyleFrom_ResourceFile">
        <Setter Property="Width" Value="150"></Setter>
        <Setter Property="Background" Value="Green"></Setter>
    </Style>
    <LinearGradientBrush x:Key="colorGardien" EndPoint="0.5,1" StartPoint="0.5,0">
        <GradientStop Color="Black" Offset="0"/>
        <GradientStop Color="#FFE647FF" Offset="1"/>
    </LinearGradientBrush>
</ResourceDictionary>
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