---

<Window x:Class="WpfApp2.MainWindow"
        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:WpfApp2"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="7*"/>
            <ColumnDefinition Width="3*"/>
        </Grid.ColumnDefinitions>
        <DataGrid x:Name="DgGrade"/>
        <StackPanel Grid.Column="1">
            <TextBlock Text="введите предмет"/>
            <TextBox x:Name="TbSubject"/>
            <TextBlock Text="введите оценку"/>
            <TextBox x:Name="TbGrade"/>
            <Button x:Name="BtAdd" Content="add" Click="BtAdd_Click"/>
            <Button x:Name="BtSave" Content="save" Click="BtSave_Click"/>
        </StackPanel>
    </Grid>
</Window>