Otel/HotelCalifornia/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 HotelCalifornia
{
    /// <summary>
    /// Логика взаимодействия для MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();        
        }
        Variant variant = new Variant();
        private void Grid_MouseDown(object sender, MouseButtonEventArgs e)
        {
            DragMove();
        }

        private void Close(object sender, RoutedEventArgs e)
        {
            MessageBoxResult result = MessageBox.Show("Вы хотите выйти из приложения?", "Предупреждение", MessageBoxButton.YesNo, MessageBoxImage.Question);
            switch (result)
            {
                case MessageBoxResult.Yes:
                    Application.Current.Shutdown();
                    break;
                case MessageBoxResult.No:         
                    break;
            }                 
        }

        private void Vhod(object sender, RoutedEventArgs e)
        {
            if (logintxt.Text == "" || passwordtxt.Password == "")
            {
                MessageBox.Show("Поля не могут быть пустыми!", "Предупреждение", MessageBoxButton.OK, MessageBoxImage.Information);
            }
            else
            {
                this.Close();
                variant.Show();
            }
        }
    }
}