UIFIS/OUP/MainViewModel.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;

namespace OUP
{
    public class MainViewModel : BaseViewModel
    {
        private RelayCommand _authcommand;




        private string _login;
        private string _password;

        public string Login
        {
            get => _login;
            set

            {
                _login = value;
                OnPropertyChanged();
            }
        }
        public string Password
        {
            get => _password;
            set
            {
                _password = value;
                OnPropertyChanged();
            }
        }
        public RelayCommand AuthCommand
        {
            get
            {
                return _authcommand ??
                        (_authcommand = new RelayCommand((x) =>
                        {
                            var authUser = Helper.GetContext().Employees.SingleOrDefault(user => user.Login == Login && user.Password == Password);
                            if (authUser == null)
                            {
                                MessageBox.Show("Введите верный логин и пароль");
                                return;
                            }
                            else
                            {
                                OUP Window1 = new OUP();
                                Window1.Show();
                            }



                        }));
            }
        }
    }
}