private void PDS_FormClosed(object sender, EventArgs e)
{
PostageChargeCalculator pcc = new PostageChargeCalculator();
pcc.removeAllTxts();
}
private void closeBtn_Click(object sender, EventArgs e)
{
PostageChargeCalculator pcc = new PostageChargeCalculator();
pcc.removeAllTxts();
this.Close();
}