CopyCenter/CopyCenter/CardsWindow.xaml

<Window x:Class="CopyCenter.CardsWindow"
        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:CopyCenter"
        mc:Ignorable="d"
        Title="Дисконтные карты" Height="450" Width="800">
    <Grid>
        <DataGrid Name="CardsList" AutoGenerateColumns="False">
            <DataGrid.Columns>
                <DataGridTextColumn  Header="Номер" Binding="{Binding NumberCard}"></DataGridTextColumn>
                <DataGridTextColumn Header="Тип" Binding="{Binding TypeCard}"></DataGridTextColumn>
                <DataGridTextColumn Header="Номер клиента" Binding="{Binding idClient}"></DataGridTextColumn>
            </DataGrid.Columns>
        </DataGrid>
        <Button Content="" HorizontalAlignment="Right" Margin="0,369,10,0" VerticalAlignment="Top" Width="45" Click="Exit_Click" Height="40">
            <Button.Background>
                <ImageBrush ImageSource="exit_PNG29.png"/>
            </Button.Background>
        </Button>
        <Button Content="Добавить" HorizontalAlignment="Left" Margin="385,369,0,0" VerticalAlignment="Top" Width="100" Height="40" Click="Add"/>
        <Button Content="Удалить" HorizontalAlignment="Left" Margin="503,369,0,0" VerticalAlignment="Top" Width="100" Height="40" Click="Delete"/>
        <Button Content="Обновить" HorizontalAlignment="Left" Margin="622,369,0,0" VerticalAlignment="Top" Width="100" Height="40" Click="Update"/>
        <TextBox Name="Number" HorizontalAlignment="Left" Height="40" Margin="385,324,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="100"/>
        <TextBox Name="TypeCard" HorizontalAlignment="Left" Height="40" Margin="503,324,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="100"/>
        <TextBox Name="idClient" HorizontalAlignment="Left" Height="40" Margin="622,324,0,0" TextWrapping="Wrap" VerticalAlignment="Top" Width="100"/>


    </Grid>
</Window>