private void btnHapusBarang_Click(object sender, EventArgs e)
{
Barang barang = new Barang();
barang.setId(Convert.ToInt32(txtIdBarang.Text));
Console.WriteLine(barang.getId());
barang.Delete();
foreach (Control ctrl in mtpBarang.Controls)
{
if (ctrl is TextBox)
{
ctrl.Text = "";
}
}
MessageBox.Show("Barang berhasil dihapus.");
}