/// <summary>
/// proceed button takes the user input on the given fields,
/// stores it into global utilities, to be used later,
/// and moves to PaymentType form
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void ProceedButton_Click(object sender, EventArgs e)
{
this.Close();
GlobalUtilities.setCustomerTIN(tinTextBox.Text);
GlobalUtilities.setCustomerBusinessStyle(businessStyleTextBox.Text);
GlobalUtilities.setCustomerTerms(termsTextBox.Text);
GlobalUtilities.setCustomerOSCA(oscaTextBox.Text);
PaymentAndCustomerType paymentAndCustomerType = new PaymentAndCustomerType();
paymentAndCustomerType.ShowDialog();
}