eCompanies/eCompanies/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 eCompanies
{
    /// <summary>
    /// Логика взаимодействия для MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            doSomethingWithDb();
        }


        private void addTextToBlock(string str = "")
        {
            textBlock.Text += ("\n" + str);
        }

        private void doSomethingWithDb()
        {
            using (var db = new CompaniesDBContext())
            {
                db.Companies.Add(new Companies { Name = "Unknown company", ContractStatus = Companies.Status.NotReachedYet.ToString() });
                var count = db.SaveChanges();
                addTextToBlock(count + " records saved to database");

                addTextToBlock();
                addTextToBlock("All companies in database:");
                foreach (var company in db.Companies)
                    addTextToBlock(" - " + company.Name);
            }
        }
    }
}