stud/students/MainWindow.xaml

<Window x:Class="students.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:students"
        mc:Ignorable="d"
        Title="Студенты" Height="500" Width="800">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="4*"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>
        <DataGrid x:Name="studGrid" AutoGenerateColumns="False" IsReadOnly="True">
            <DataGrid.Columns>
                <DataGridTextColumn Header="Фамилия" Binding="{Binding last_name}" Width="*"/>
                <DataGridTextColumn Header="Имя" Binding="{Binding first_name}" Width="*"/>
                <DataGridTextColumn Header="Отчество" Binding="{Binding middle_name}" Width="*"/>
                <DataGridTextColumn Header="Дата рождения" Binding="{Binding birthdate}" Width="Auto"/>
                <DataGridTextColumn Header="Год поступления" Binding="{Binding year_entrance}" Width="Auto"/>
                <DataGridTextColumn Header="Курс" Binding="{Binding course}" Width="*"/>
                <DataGridTextColumn Header="Группа" Binding="{Binding study_group}" Width="*"/>
                <DataGridTextColumn Header="Средний балл" Binding="{Binding average_score}" Width="*"/>
            </DataGrid.Columns>
        </DataGrid>
        <Label Content="Средний балл группы: 4.34" Grid.Row="1" FontSize="20" HorizontalAlignment="Left" VerticalAlignment="Center"/>
    </Grid>
</Window>