datagridview如何记录行号的选择
datagridview可以选择多行，当被选择行中的某个字段等于1的时候，按键1（Buttion1）的Enable为false，当包含字段值为1的行被取消选择时，按键的Enable为true。求大神帮忙指点！！！
------解决方案--------------------
xaml:

<Window x:Class="WpfApplication2.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  CellEditEnding="dataGrid1_CellEditEnding" AutoGenerateColumns="False" Height="198" HorizontalAlignment="Left" Margin="50,41,0,0" Name="dataGrid1" VerticalAlignment="Top" Width="377">

            <DataGrid.Columns>

                <DataGridTextColumn Header="选择" Binding="{Binding Count}" Width="100" />

            </DataGrid.Columns>

        </DataGrid>

        <Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="308,12,0,0" Name="button1" VerticalAlignment="Top" Width="75" />

    </Grid>

</Window>

.cs:

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;



namespace WpfApplication2

{

    /// <summary>

    /// MainWindow.xaml 的交互逻辑

    /// </summary>

    public partial class MainWindow : Window

    {

        public MainWindow()

        {

            InitializeComponent();

            dataGrid1.ItemsSource = new number[]

            {

                new number(){ Count = "1" },

                new number(){ Count = "2" },

                new number(){ Count = "3" },

                new number(){ Count = "4" },

                new number(){ Count = "4" }