UIFIS/OUP/Sign in.xaml

<Window x:Class="OUP.Sign_in"
        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:OUP"
        mc:Ignorable="d"
        Title="Sign_in" Height="450" Width="400">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition/>
            <ColumnDefinition/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition/>
            <RowDefinition/>
            <RowDefinition/>
        </Grid.RowDefinitions>
        <TextBlock Margin="5" HorizontalAlignment="Right" VerticalAlignment="Center" Text="Логин"></TextBlock>
        <TextBlock Margin="5" HorizontalAlignment="Right" VerticalAlignment="Center" Grid.Row="1" Text="Пароль"></TextBlock>
        <TextBox Grid.Column="1" VerticalAlignment="Center" Margin="5" Text="{Binding Login}"></TextBox>
        <TextBox Grid.Column="1" Grid.Row="1" VerticalAlignment="Center" Margin="5" Text="{Binding Password}"></TextBox>
        <Button  Height="30" Width="150" Margin="5" Content="Войти" Grid.Column="1" Grid.Row="2" Command="{Binding AuthCommand}" Click="Button_Click"></Button>
    </Grid>
</Window>