private void login_Click(object sender, RoutedEventArgs e)
        {
            var res = rollingMachinesContext.GetUser(nikName.Text, password.Text);

            if (res.Count == 1)
            {
                BasicWindow basicWindow = new BasicWindow(res[0]);
                basicWindow.Show();
                this.Close();
            }
            else if (res.Count == 0)
            {
                error.Text = "Error in NikName or Password";
            }
            else
            {
                MessageBox.Show("Error data");
            }
        }
        private void registration_Click(object sender, RoutedEventArgs e)
        {
            if (password1.Text != password2.Text)
            {
                error.Text = "Error Password not the Same";
            }
            else
            {
                if ((String.IsNullOrEmpty(nikname.Text) || String.IsNullOrEmpty(firstname.Text) || String.IsNullOrEmpty(surname.Text) || String.IsNullOrEmpty(phone.Text) || String.IsNullOrEmpty(password1.Text)))
                {
                    error.Text = "Error in empty cells cannot be";
                }
                else
                {
                    var help = rollingMachinesContext.GetUsers(nikname.Text);
                    if (help.Count == 0)
                    {
                        User user = new User();
                        user.NikName   = nikname.Text;
                        user.FirstName = firstname.Text;
                        user.SurName   = surname.Text;
                        user.Phone     = phone.Text;
                        user.Password  = password1.Text;
                        rollingMachinesContext.AddUser(user);

                        BasicWindow basicWindow = new BasicWindow(user);
                        basicWindow.Show();
                        this.Close();
                    }
                    else
                    {
                        error.Text = "THIS NIKNAME NOT GOOD";
                    }
                }
            }
        }