private void saveButton_Click(object sender, EventArgs e)
        {
            User user = new User();

            user.Name         = firstNameTextBox.Text;
            user.LastName     = lastNameTextBox.Text;
            user.Birthday     = Convert.ToDateTime(birthdayTextBox.Text);
            user.Age          = DateTime.Now.Year - user.Birthday.Year;
            user.EmailAddress = emailAddressTextBox.Text;
            user.Office       = selectOfficeComboBox.SelectedItem.ToString();
            user.UserRole     = "Сотрудник";
            user.Password     = passwordTextBox.Text;

            db.AddUser(user);

            form.DeblockForm();
            this.Close();
        }