/**
         * Method to add employee to the database
         */
        private void btnAddEmployee_Click(object sender, EventArgs e)
        {
            UpdateOrAdd updateOrAddForm = new UpdateOrAdd(department);

            updateOrAddForm.StartPosition = FormStartPosition.CenterParent;
            updateOrAddForm.ShowDialog(this);
        }
        /**
         * Method to update employee's information
         */
        private void btnUpdateEmployee_Click(object sender, EventArgs e)
        {
            if (lbEmployees.SelectedItem != null || lbManagers.SelectedItem != null)
            {
                Staff staff = SearchSelectedStaff();

                if (staff != null)
                {
                    UpdateOrAdd form = new UpdateOrAdd(department, staff);
                    form.Show();
                }
            }
            else
            {
                MessageBox.Show("Action could not be performed, Please select a staff member.");
            }
        }