<Window x:Class="WpfDataGrid.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:WpfDataGrid"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
     <Grid>

          <DataGrid AutoGenerateColumns="False"
               Margin="10"
               IsReadOnly="True"
               ItemsSource="{Binding MyData}"
               FontFamily="Gisha" FontSize="20">

               <!-- color for selected row -->
               <DataGrid.Resources>
                    <Style TargetType="{x:Type DataGridCell}">
                         <Style.Triggers>
                              <Trigger Property="DataGridCell.IsSelected" Value="True">
                                   <Setter Property="Background" Value="Green" />
                              </Trigger>
                         </Style.Triggers>
                    </Style>
               </DataGrid.Resources>

               <!-- columns and rows -->
               <DataGrid.Columns>

                    <!-- text column -->
                    <DataGridTextColumn Header="My Customer" Binding="{Binding Customer}" Width="150" />

                    <!-- text column -->
                    <DataGridTextColumn Header="My Item" Binding="{Binding Item}" Width="150"/>

                    <!-- text column -->
                    <DataGridTextColumn Header="My Price" Binding="{Binding Price}" Width="150"/>
                   
               </DataGrid.Columns>

          </DataGrid>

     </Grid>
</Window>

using System.Collections.ObjectModel;
using System.Windows;

namespace WpfDataGrid
{
     public class MyShop
     {
          public string Customer { get; set; }
          public string Item { get; set; }
          public string Price { get; set; }
     }

     public partial class MainWindow : Window
     {
          public ObservableCollection<MyShop> MyData { get; set; }

          public MainWindow()
          {
               InitializeComponent();

               // for binding
               this.DataContext = this;

               // data for grid
               MyData = new ObservableCollection<MyShop>()
               {
                         new MyShop() {Customer="ACME", Item="Widget", Price="100"},
                         new MyShop() {Customer="ACME", Item="Widget", Price="100"},
                         new MyShop() {Customer="ACME", Item="Tyre", Price="200"},
                         new MyShop() {Customer="Amazon", Item="Pen", Price="50"},
                         new MyShop() {Customer="Amazon", Item="Paper", Price="20"},
                         new MyShop() {Customer="Autodesk", Item="CAD", Price="10"},
                         new MyShop() {Customer="Autodesk", Item="File", Price="40"},
                         new MyShop() {Customer="ABC", Item="Flowers", Price="503"},
                         new MyShop() {Customer="ABC", Item="Sand", Price="706"}
               };
          }

     }
}