private void btnAddProdToPkg_Click(object sender, EventArgs e)
{
PackageDB.AddProductToPackage(Convert.ToInt32(cbPack.SelectedValue), Convert.ToInt32(cbProduct.SelectedValue));
lblAddProdPkg.Text = "Product has been added to the selected package";
products_SuppliersDataGridView.DataSource = Products_SuppliersDB.GetProductsSuppliers();
}