/// <summary>
        /// Method for editing selected contact
        /// Opens a new ContactForm if a current customer is selected
        /// If a customer is selected, it retrieves ContactData for that Customer and
        /// calls ChangeCustomer from CustomerManager. Finally updates the list.
        /// Hides submenus upon click.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void bttnEdit_Click_1(object sender, EventArgs e)
        {
            ContactForm frmContact = new ContactForm("Edit Customer");


            int index = listBoxCustomers.SelectedIndex;

            if (listBoxCustomers.SelectedItems.Count != 1)
            {
                MessageBox.Show("Please select a current customer to edit");
                return;
            }

            if (index >= 0)
            {
                frmContact.ContactData = customerMngr.GetCustomer(index).ContactData;
                frmContact.ShowDialog();
                customerMngr.ChangeCustomer(frmContact.ContactData, index);
                UpdateList();
            }

            HideMenus();
        }
        /// <summary>
        /// Search button.
        ///
        /// Checks if input is emptry or if listbox is empty
        /// If not; calls SearchCustomer method in CustomerManager with text in txtBoxSearch
        /// and retrieves Contact data. Creates ContactForm window with ContactData.
        /// Also empties the textbox
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void bttnSearch_Click_1(object sender, EventArgs e)
        {
            string      name       = txtBoxSearch.Text;
            ContactForm frmContact = new ContactForm("Edit Searched Customer");

            Customer customer = new Customer();

            int index = listBoxCustomers.SelectedIndex;

            if (string.IsNullOrEmpty(name))
            {
                MessageBox.Show("Enter the full name of a current customer", "Error", MessageBoxButtons.OK);
            }
            else
            {
                if (listBoxCustomers.Items.Count > 0)
                {
                    if (customerMngr.SearchCustomer(name) != null && name.Equals(customerMngr.SearchCustomer(name).ContactData.CompleteName))
                    {
                        frmContact.ContactData = customerMngr.SearchCustomer(name).ContactData;
                        frmContact.ShowDialog();

                        txtBoxSearch.Text = string.Empty;
                    }

                    else
                    {
                        MessageBox.Show("Customer not found", "Error", MessageBoxButtons.OK);
                    }
                }
                else if (listBoxCustomers.Items.Count == 0)
                {
                    MessageBox.Show("Your customer registry is empty!");
                }
            }
            HideMenus();
        }