test1/WpfApp5/MainWindow.xaml.cs

using System;
using System.Collections.Generic;
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 WpfApp5
{
    /// <summary>
    /// Логика взаимодействия для MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            mybaseEntities mybase = new mybaseEntities();//создали обект
            tableMatetial.ItemsSource = mybase.Material.ToList();//поместили таблицу в источник данных 
        }

        private void button_Click(object sender, RoutedEventArgs e)
        {
            WindowSupplier windowSupplier = new WindowSupplier();
            windowSupplier.Show();
        }
    }
}