Xaml:
<Window.Resources>
        <Style  TargetType="TextBox">
            <Setter Property="Height" Value="30"/>
            <Setter Property="Background" Value="AliceBlue"/>
            <Setter Property="Visibility" Value="{Binding MyVisibility}"/>

        </Style>
        <Style x:Key="textbox1" TargetType="TextBox">
            <Setter Property="Height" Value="30"/>
            <Setter Property="Background" Value="Pink"/>
            <Setter Property="Visibility" Value="{Binding MyVisibility1}"/>

        </Style>
    </Window.Resources>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <TextBox x:Name="lab_code" />
        <TextBox x:Name="lab_destinataire"  Grid.Row="1"/>
        <TextBox x:Name="Form_code" Grid.Row="2" />
        <TextBox x:Name="Form_destinataire" Grid.Row="3"/>
        <TextBox x:Name="Titre_clients" Grid.Row="4"/>
        <TextBox x:Name="lab_traffic" Grid.Row="5"/>
        <TextBox x:Name="Form_trafic" Grid.Row="6"/>
        <TextBox x:Name="Form_bgpcli" Grid.Row="7"/>
        <TextBox x:Name="lab_plat" Grid.Row="8" Style="{StaticResource textbox1}" />
        <TextBox x:Name="Form_plateforme" Grid.Row="9" Style="{StaticResource textbox1}"/>
        <Button x:Name="btn" Click="btn_Click" Width="100" Height="30" Content="change" Grid.Row="10"/>
    </Grid>
Codebehind:

public partial class MainWindow : Window, INotifyPropertyChanged
    {
        public MainWindow()
        {
            InitializeComponent();
            DataContext = this;
        }

        private Visibility _visibility = Visibility.Visible;
        public Visibility MyVisibility
        {
            get { return _visibility; }
            set
            {
                _visibility = value;
                OnPropertyChanged("MyVisibility");
              
            }
        }
        private Visibility _visibility1 = Visibility.Collapsed;
        public Visibility MyVisibility1
        {
            get { return _visibility1; }
            set
            {
                _visibility1 = value;
                OnPropertyChanged("MyVisibility1");
            }
        }
        public event PropertyChangedEventHandler PropertyChanged;
        protected void OnPropertyChanged([CallerMemberName] string name = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
        }
        private void btn_Click(object sender, RoutedEventArgs e)
        {
            MyVisibility1=Visibility.Visible;
            MyVisibility=Visibility.Collapsed;
        }
    }