ClearTest/WpfApp1/pgAddHotel.xaml

<Page x:Class="WpfApp1.pgAddHotel"
      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:WpfApp1"
      mc:Ignorable="d" 
      d:DesignHeight="450" d:DesignWidth="800"
      Title="pgAddHotel">

    <Grid>
        <StackPanel>
            <TextBox Text="{Binding Name}"></TextBox>
            <TextBox Text="{Binding CountOfStars}" Name="tbStars"></TextBox>
            <ComboBox Name="cbCountry" SelectionChanged="cbCountry_SelectionChanged"></ComboBox>
            <TextBox Text="{Binding Description}" AcceptsReturn="True"></TextBox>
            <Button Name="btnSave" Click="btnSave_Click" Content="Сохранить"></Button>
        </StackPanel>
    </Grid>
</Page>