csharp: Data binding in WPF DataGrid control

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<Window x:Class="WpfProjectDemo.MainWindow"         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"         Title="MainWindow" Height="350" Width="525" xmlns:dxlc="http://schemas.devexpress.com/winfx/2008/xaml/layoutcontrol">     <Grid>         <DataGrid AutoGenerateColumns="False" Height="59" HorizontalAlignment="Left" Margin="50,39,0,0" Name="dataGrid1" VerticalAlignment="Top" Width="272" MinRowHeight="20" MinHeight="10" Loaded="dataGrid1_Loaded">         <DataGrid.Columns>                 <DataGridTextColumn Binding="{Binding Path=id}" Header="序号" FontWeight="Bold"/>                 <DataGridTextColumn Binding="{Binding Path=name}" Header="姓名"/>           </DataGrid.Columns>          </DataGrid>         <DataGrid AutoGenerateColumns="False" Height="112" HorizontalAlignment="Left" Margin="47,148,0,0" Name="dataGrid2" VerticalAlignment="Top" Width="326" Loaded="dataGrid2_Loaded">             <DataGrid.Columns>                 <DataGridTextColumn Binding="{Binding Path=ID}" Header="序号" FontWeight="Bold"/>                 <DataGridTextColumn Binding="{Binding Path=Name}" Header="姓名"/>                 <DataGridTextColumn Binding="{Binding Path=BookTitle}" Header="书藉名称" FontWeight="Bold"/>                 <DataGridTextColumn Binding="{Binding Path=CreatDate}" Header="创作日期"/>                 <DataGridTextColumn Binding="{Binding Path=IsMVP}" Header="是否MVP" FontWeight="Bold"/>                               </DataGrid.Columns>             </DataGrid>               </Grid> </Window>     using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Navigation; using System.Windows.Shapes; using System.Data;   namespace WpfProjectDemo {     /// <summary>     /// MainWindow.xaml 的交互逻辑     /// </summary>     public partial class MainWindow : Window     {         /// <summary>         ///         /// </summary>         /// <returns></returns>         DataTable setData()         {             DataTable dt = new DataTable();             dt.Columns.Add("id", typeof(int));             dt.Columns.Add("name", typeof(string));             dt.Rows.Add(1, "geovindu");             dt.Rows.Add(2, "涂聚文");             return dt;         }             /// <summary>         ///         /// </summary>         public MainWindow()         {             InitializeComponent();                       }             /// <summary>         /// List of Authors         /// </summary>         /// <returns></returns>         private List<Author> LoadCollectionData()         {             List<Author> authors = new List<Author>();             authors.Add(new Author()             {                 ID = 101,                 Name = "Geovin Du",                 BookTitle = "Graphics Programming with GDI+",                 CreatDate = new DateTime(1975, 2, 23),                 IsMVP = false             });             authors.Add(new Author()             {                 ID = 201,                 Name = "涂聚文",                 BookTitle = "Programming C#",                 CreatDate = new DateTime(1982, 4, 12),                 IsMVP = true             });             authors.Add(new Author()             {                 ID = 244,                 Name = "塗聚文",                 BookTitle = "LINQ in Vista",                 CreatDate = new DateTime(1985, 9, 11),                 IsMVP = true             });             return authors;         }         /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void dataGrid1_Loaded(object sender, RoutedEventArgs e)         {            // var grid = sender as DataGrid;            // grid.ItemsSource = LoadCollectionData();            //this.dataGrid1.ItemsSource = LoadCollectionData();            this.dataGrid1.ItemsSource = setData().DefaultView;         }         /// <summary>         ///         /// </summary>         /// <param name="sender"></param>         /// <param name="e"></param>         private void dataGrid2_Loaded(object sender, RoutedEventArgs e)         {             this.dataGrid2.ItemsSource = LoadCollectionData();         }         }           public class Author     {         public int ID { get; set; }         public string Name { get; set; }         public DateTime CreatDate { get; set; }         public string BookTitle { get; set; }         public bool IsMVP { get; set; }     } }