metodichka/metodichka/RegistrationWindow.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.Shapes;

namespace metodichka
{
    /// <summary>
    /// Логика взаимодействия для RegistrationWindow.xaml
    /// </summary>
    public partial class RegistrationWindow : Window
    {
        gr683_shdaEntities db;
        public RegistrationWindow()
        {
            InitializeComponent();
            db = new gr683_shdaEntities();
        }
      

        private void RegistrationClick(object sender, RoutedEventArgs e)
        {
           
            if(login.Text==""|| password.Password=="" || lastName.Text=="" || firstName.Text=="" || middleName.Text=="")
            {
                MessageBox.Show("Пустые поля");
                return;
            }
            if(db.User.Select(item=>item.Login).Contains(login.Text))
            {

            }
            User newUser = new User()
            {
                Login = login.Text,
                Password = password.Password,
                LastsName = lastName.Text,
                FirstName = firstName.Text,
                MiddleName = middleName.Text
            };
            db.User.Add(newUser);
            db.SaveChanges();
            MessageBox.Show("Вы успешно зарегистрировались");
            Window1 aw = new Window1();
            aw.Show();
            this.Close();


        }

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