private void Form_ButtonClicked(object sender, CustomerEditEventArgs e)
{
selectedCustomer.companyName = e.Name;
selectedCustomer.phoneNumber = e.Phone;
selectedCustomer.email = e.Email;
selectedCustomer.address = e.Address;
}
private void btnUpdate_Click(object sender, RoutedEventArgs e)
{
string customerName = tbx_CompanyName.Text;
string customerPhone = tbx_PhoneNo.Text;
string customerEmail = tbx_Email.Text;
string customerAddress = tbx_Address.Text;
this.DialogResult = true;
CustomerEditEventArgs args = new CustomerEditEventArgs
(customerName, customerPhone, customerEmail, customerAddress);
CustomerUpdated(this, args);
this.Close();
}