private void button2_Click(object sender, EventArgs e)
{
InsertSupplier iis = new InsertSupplier();
iis.FormClosed += new FormClosedEventHandler(iis_FormClosed);
iis.Show();
}
private void AddSupplier_Click(object sender, EventArgs e)
{
InsertSupplier IS = new InsertSupplier();
IS.Show();
}