InformationSystemTestingRepo/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 RegAuth
{
    /// <summary>
    /// Логика взаимодействия для MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        gr683_teoEntities db;
        public MainWindow()
        {
           InitializeComponent();
           db = new gr683_teoEntities();
        }

        private void AuthClick(object sender, RoutedEventArgs e)
        {
            String loginText, passwordText;
            loginText = login.Text;
            passwordText = password.Password;
            if(loginText.Equals("") || passwordText.Equals(""))
            {
                MessageBox.Show("Не все поля заполнены");
                return;
            }
            if (db.Users.Select(item => item.Login + " " + item.Password).Contains(loginText + " " + passwordText))
            {
                MessageBox.Show("Вы успешано авторизавались");
            }
            else
            {
                MessageBox.Show("Неверный логин или пароль");
            }
        }

        private void RegClick(object sender, RoutedEventArgs e)
        {
            new Window1().Show();
            this.Close();
        }

   
    }
}