MainWindow.xaml

<dx:ThemedWindow
    x:Class="InfiniteAsyncSourceODataSample.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:dx="http://schemas.devexpress.com/winfx/2008/xaml/core"
    xmlns:dxe="http://schemas.devexpress.com/winfx/2008/xaml/editors"
    xmlns:dxlc="http://schemas.devexpress.com/winfx/2008/xaml/layoutcontrol"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    Title="MainWindow"
    Width="600"
    Height="350"
    mc:Ignorable="d">

    <DockPanel>
        <dxe:AutoSuggestEdit
            x:Name="autoSuggestEdit"
            MaxWidth="400"
            VerticalAlignment="Center"
            DisplayMember="Subject"
            DockPanel.Dock="Top"
            ImmediatePopup="True"
            NullText="Enter more than three characters and wait for a few seconds..."
            PopupHeight="500"
            PopupWidth="700"
            QuerySubmitted="QuerySubmitted"
            SuggestionChosen="SuggestionChosen"
            TextMember="Subject" />
        <dxlc:DataLayoutControl x:Name="layoutControl" IsReadOnly="True" />
    </DockPanel>

</dx:ThemedWindow>