Cxz/ReductAdd.xaml

<Window x:Class="Learn.ReductAdd"
        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:Learn"
        mc:Ignorable="d"
        Title="ReductAdd" Height="450" Width="800">
    <Grid>
        <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center" Width="200">
            <TextBlock HorizontalAlignment="Center">Название класса</TextBlock>
            <TextBox Name="ServName"/>
            <TextBlock HorizontalAlignment="Center">Стоимость</TextBlock>
            <TextBox Name="Price"/>
            <TextBlock HorizontalAlignment="Center">Длительность в секундах</TextBlock>
            <TextBox Name="Duration"/>
            <TextBlock HorizontalAlignment="Center">Описание</TextBlock>
            <TextBox Height="100" Name="Disc"/>
            <TextBlock HorizontalAlignment="Center">Скидка</TextBlock>
            <TextBox Name="Promo"/>
            <Button Margin="0,10,0,0" Click="FixChanges">
                <Button.Content>
                    <TextBlock TextWrapping="Wrap">Измененить/ Добавить класс</TextBlock>
                </Button.Content>
            </Button>
        </StackPanel>
    </Grid>
</Window>