private void ADD_Click(object sender, EventArgs e)
{
if (Retailer.Checked)
{
ApplicationManager.addBuyer(BuyerID.Text, BuyerName.Text, Retailer.Text);
}
if (WholeSaller.Checked)
{
ApplicationManager.addBuyer(BuyerID.Text, BuyerName.Text, WholeSaller.Text);
}
BuyerID.Text = BuyerID.Name;
BuyerName.Text = BuyerName.Name;
Retailer.Checked = false;
WholeSaller.Checked = false;
}