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    copied!<p>Here is my complete code. I hope this will help.</p> <p>The xaml code:</p> <pre><code>&lt;Window x:Class="DataGridSort.Window1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:dg="clr-namespace:Microsoft.Windows.Controls;assembly=WPFToolkit" xmlns:System="clr-namespace:System;assembly=mscorlib" Title="Window1" Height="413" Width="727" x:Name="_this"&gt; &lt;Window.Resources&gt; &lt;ObjectDataProvider ObjectInstance="_this.DataContext" MethodName="GetFromDate" x:Key="odp"&gt; &lt;ObjectDataProvider.MethodParameters&gt; &lt;System:DateTime&gt;2008-01-01&lt;/System:DateTime&gt; &lt;/ObjectDataProvider.MethodParameters&gt; &lt;/ObjectDataProvider&gt; &lt;/Window.Resources&gt; &lt;Grid&gt; &lt;Grid.RowDefinitions&gt; &lt;RowDefinition Height="Auto"/&gt; &lt;RowDefinition Height="*"/&gt; &lt;/Grid.RowDefinitions&gt; &lt;dg:DatePicker Grid.Row="0" x:Name="dtpSource" &gt; &lt;dg:DatePicker.SelectedDate&gt; &lt;Binding Source="{StaticResource odp}" Path="MethodParameters[0]" BindsDirectlyToSource="True" Mode="OneWayToSource"/&gt; &lt;/dg:DatePicker.SelectedDate&gt; &lt;/dg:DatePicker&gt; &lt;dg:DataGrid x:Name="dtgGrid" ItemsSource="{Binding Source={StaticResource odp}}" AutoGenerateColumns="True" Grid.Row="1"/&gt; &lt;/Grid&gt; &lt;/Window&gt; </code></pre> <p>The code behind:</p> <pre><code>public partial class Window1 : Window { public Window1() { InitializeComponent(); LoadData(); } protected void LoadData() { DataContext = new Data(); ObjectDataProvider odp = this.Resources["odp"] as ObjectDataProvider; odp.ObjectInstance = DataContext; } } </code></pre> <p>and the business object:</p> <pre><code>public class DataItem { public string Name { get; set; } public int BirthYear { get; set; } } public class Data { private readonly List&lt;DataItem&gt; data; public Data() { data = new List&lt;DataItem&gt;(); data.Add(new DataItem { Name = "John", BirthYear = 2007 }); data.Add(new DataItem { Name = "Mike", BirthYear = 2007 }); data.Add(new DataItem { Name = "Aaron", BirthYear = 2006 }); data.Add(new DataItem { Name = "Bill", BirthYear = 2006 }); data.Add(new DataItem { Name = "Steven", BirthYear = 2005 }); data.Add(new DataItem { Name = "George", BirthYear = 2004 }); data.Add(new DataItem { Name = "Britany", BirthYear = 2004 }); } public List&lt;DataItem&gt; GetFromDate(DateTime dt) { return this.data.Where(d =&gt; d.BirthYear == dt.Year).ToList(); } } </code></pre>
 

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