MainWindow.xaml

<Window x:Class="EntityFrameworkIssues.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:EntityFrameworkIssues"
        xmlns:local_issues="clr-namespace:EntityFrameworkIssues.Issues" xmlns:dxg="http://schemas.devexpress.com/winfx/2008/xaml/grid"
        mc:Ignorable="d" Title="MainWindow"
        Height="450" Width="800">
    <Grid>
        <dxg:GridControl x:Name="grid">
            <dxg:GridControl.View>
                <dxg:TableView ShowFixedTotalSummary="True" />
            </dxg:GridControl.View>
            <dxg:GridColumn FieldName="Id" IsSmart="True"
                            ReadOnly="True" />
            <dxg:GridColumn FieldName="FirstName" IsSmart="True" />
            <dxg:GridColumn FieldName="LastName" IsSmart="True" />
            <dxg:GridControl.TotalSummary>
                <dxg:GridSummaryItem SummaryType="Count" Alignment="Right" />
            </dxg:GridControl.TotalSummary>
        </dxg:GridControl>
    </Grid>
</Window>