using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
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;
 
namespace WpfApplication4
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
 
    public partial class MainWindow : Window
    {
        
        public MainWindow()
        {
            InitializeComponent();
            dg.Items.Add(new Row { first = "AA", second = "BB" });
            dg.Items.Add(new Row { first = "CC", second = "DD" });
            dg.Items.Add(new Row { first = "EE", second = "FF" });
            dg.Items.Add(new Row { first = "GG", second = "HH" });
            dg.Items.Add(new Row { first = "II", second = "JJ" });
            dg.Items.Add(new Row { first = "KK", second = "LL" });
            dg.Items.Add(new Row { first = "MM", second = "NN" });
            dg.Items.Add(new Row { first = "OO", second = "PP" });
            dg.Items.Add(new Row { first = "QQ", second = "RR" });
            dg.Items.Add(new Row { first = "SS", second = "TT" });
            dg.Items.Add(new Row { first = "UU", second = "VV" });
            dg.Items.Add(new Row { first = "WW", second = "XX" });
            dg.Items.Add(new Row { first = "YY", second = "ZZ" });
        }
 
 
        public class Row
        {
            public string first { get; set; }
            public string second { get; set; }
        }
    }
}

<Window x:Class="WpfApplication4.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">
    <Grid>
        <DataGrid x:Name="dg"  Width="500" Height="300" AutoGenerateColumns="False">
            <DataGrid.Columns>
                <DataGridTextColumn Header="first" Width="100" Binding="{Binding first}"></DataGridTextColumn>
                <DataGridTextColumn Header="second" Width="100" Binding ="{Binding second}"></DataGridTextColumn>
            </DataGrid.Columns>
        </DataGrid>
    </Grid>
</Window>