WPF_Practice/PacticeSolution/DataBindByINotifyPropertyChangedSample/MainWindow.xaml

<Window x:Class="DataBindByINotifyPropertyChangedSample.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:DataBindByINotifyPropertyChangedSample"
        xmlns:vm="clr-namespace:DataBindByINotifyPropertyChangedSample.ViewModel"
        mc:Ignorable="d"
        Title="MainWindow" Height="250" Width="450">
    <Window.DataContext>
        <vm:UserViewModel/>
    </Window.DataContext>
    
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="Auto"/>
            <ColumnDefinition Width="Auto"/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="Auto"/>
        </Grid.RowDefinitions>

        <TextBlock Grid.Column="0" Grid.Row="0" Margin="5"
                   Text="First name: "/>
        <TextBox x:Name="tbxFirstName"
                 Grid.Column="1" Grid.Row="0" Margin="5" Width="300"
                 HorizontalAlignment="Center" VerticalAlignment="Center"
                 Text="{Binding FirstName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
        
        <TextBlock Grid.Column="0" Grid.Row="1" Margin="5"
                   Text="Last name: "/>
        <TextBox x:Name="tbxLastName"
                 Grid.Column="1" Grid.Row="1" Margin="5" Width="300"
                 HorizontalAlignment="Center" VerticalAlignment="Center"
                 Text="{Binding LastName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>

        <Grid Grid.Column="1" Grid.Row="2">
            <Grid.ColumnDefinitions>
                <ColumnDefinition Width="*"/>
                <ColumnDefinition Width="*"/>
            </Grid.ColumnDefinitions>

            <Button x:Name="btnShow"
                    Grid.Column="0" Grid.Row="0" Margin="3"
                    Content="Show"
                    Click="btnShow_Click"/>
            <Button x:Name="btnChange"
                    Grid.Column="1" Grid.Row="0" Margin="3"
                    Content="Change"
                    Click="btnChange_Click"/>
        </Grid>
    </Grid>
</Window>