QWE/Firewatch 2.0/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 Firewatch_2._0
{
    /// <summary>
    /// Логика взаимодействия для RegistrationWindow.xaml
    /// </summary>
    public partial class RegistrationWindow : Window
    {
        public RegistrationWindow()
        {
            InitializeComponent();
        }

        public void Registration_Click(object sender, RoutedEventArgs e)
        {
            Reg(txtfirstName.Text, txtlastName.Text, txtmiddleName.Text, txtlogin.Text, txtpassword.Password);
        }

        public bool Reg(string login, string password, string lastName, string firstName, string middleName)
        {
            if (string.IsNullOrEmpty(login) || string.IsNullOrEmpty(password) || string.IsNullOrEmpty(lastName)
                || string.IsNullOrEmpty(firstName))
            {
                MessageBox.Show("Введите данные в поля");
                return false;
            }

            using (dbData db = new dbData())
            {
                if (db.StaffISs.Select(item => item.Login).Contains(txtlogin.Text))
                {
                    MessageBox.Show("Такой логин уже существует");
                    return false;
                }

                StaffIS staffIS = new StaffIS();
                staffIS.LastName = txtlastName.Text;
                staffIS.FirstName = txtfirstName.Text;
                staffIS.MiddleName = txtmiddleName.Text;
                staffIS.Login = txtlogin.Text;
                staffIS.Password = txtpassword.Password;
                db.StaffISs.Add(staffIS);
                db.SaveChanges();
                MessageBox.Show("Вы успешно зарегестировались");
                Close();

                return true;
            }
        }

        private void Cancel_Click(object sender, RoutedEventArgs e)
        {
            Close();
        }
    }
}