private void addAdminButton_Click(object sender, RoutedEventArgs e)
        {
            addAdminButton.IsEnabled = false;

            int result = databaseHandler.AddAdmin(new Client
            {
                FirstName      = @firstNameTB.Text,
                SecondName     = @secondNameTB.Text,
                CompanyName    = @companyNameTB.Text,
                Email          = @emailTB.Text,
                PhoneNumber    = @phoneTB.Text,
                Country        = @countryTB.Text,
                City           = @cityTB.Text,
                Street         = @streetTB.Text,
                Postcode       = @postcodeTB.Text,
                BuildingNumber = @buildingTB.Text,
                Username       = @usernameTB.Text,
                Password       = @passwordTB.Text,
                IsAdmin        = 1
            }
                                                  );

            if (result == 1)
            {
                MessageBox.Show("A new account has been created.", "Success!", MessageBoxButton.OK);
                this.Close();
            }
            else
            {
                MessageBox.Show("Something went wrong, please try again.", "Failure!", MessageBoxButton.OK);
                this.Close();
            }
        }