<Window x:Class="WpfApplication1.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" Loaded="Window_Loaded" IsTabStop="False">
    <Grid>
        <Label Height="28" HorizontalAlignment="Left" Margin="12,218,0,0" Name="label1" VerticalAlignment="Top" Width="198" />
        <DataGrid AutoGenerateColumns="True" Height="200" HorizontalAlignment="Left" Margin="12,12,0,0" Name="dataGrid1" VerticalAlignment="Top" Width="200" />
    </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;

namespace WpfApplication1
{
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        // Dependency Property
        public static readonly DependencyProperty MySetCountProperty =
             DependencyProperty.Register("MySetCount", typeof(Int32), typeof(MainWindow), 
                new FrameworkPropertyMetadata(0, OnMySetCountPropertyChanged)); 

        // Proprietà "wrapper" per la Dependency Property
        public int MySetCount
        {
            get { return (Int32)GetValue(MySetCountProperty); }
            set { SetValue(MySetCountProperty, value); }
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            // il mio "set" di dati    
            var mySet = new[]{ 
                new {id=1, description="test_1"},
                new {id=2, description="test_2"},
                new {id=3, description="test_3"}
            };

            // bindo il mio set di dati
            dataGrid1.ItemsSource = mySet;

            // valorizzo la proprietà "wrapper"
            MySetCount = mySet.Count();
        }

        /// <summary>
        /// Gestore dell'evento di "changed" della Dependency Property
        /// </summary>
        /// <param name="source"></param>
        /// <param name="e"></param>
        private static void OnMySetCountPropertyChanged(DependencyObject source, DependencyPropertyChangedEventArgs e)
        {
            // trovo la "MainWindow" in cui si è verificato l'evento
            MainWindow mainWindow = (MainWindow)source;
            // trovo la label da "bindare"
            object objLabel = mainWindow.FindName("label1");
            // se la trovo ne valorizzo il content con il valore assegnato alla property
            if (objLabel != null)
            {
                ((Label)objLabel).Content = ((Int32)e.NewValue).ToString();
            }
        }
    }
}

            DataAccessDbDataContext s = new DataAccessDbDataContext();
            List<tbl_Anagrafica_Azienda> dati = (from anag in s.tbl_Anagrafica_Azienda select anag).ToList();
            
            myGrid.DataContext = dati.FirstOrDefault();