AvtoservisSultik/AutoServiceSultik/Pages/LoginPage.xaml

<Page x:Class="AutoServiceSultik.Pages.LoginPage"
      xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
      xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
      xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
      xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
      xmlns:local="clr-namespace:AutoServiceSultik.Pages"
      mc:Ignorable="d" 
      d:DesignHeight="450" d:DesignWidth="800"
      Title="Авторизация">

    <Grid>
        <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center" Width="250" Height="150">
            <DockPanel Margin="10">
                <Label FontSize="15" Content="Логин: "/>
                <TextBox HorizontalAlignment="Right" Width="150" x:Name="tbLogin" FontSize="15"/>
            </DockPanel>
            <DockPanel Margin="10">
                <Label FontSize="15" Content="Пароль: "/>
                <PasswordBox HorizontalAlignment="Right" Width="150" x:Name="tbPass" FontSize="15"/>
            </DockPanel>
            <Button Background="Orange" FontSize="15" Foreground="#FFFFE1" Click="Login_Click" Content="Войти" HorizontalAlignment="Right" Width="180"/>
        </StackPanel>
    </Grid>
</Page>