//modify button pressed in products supplier tab
        private void btnModifyProductSupplier_Click(object sender, EventArgs e)
        {
            Product_Supplier productSupplier = productSuppliers[product_SupplierDataGridView.CurrentCell.RowIndex];
            //SelectRowProducts_Suppliers(); //delete later
            AddModifyProductsSupplier modifyProductsSupplier = new AddModifyProductsSupplier();

            modifyProductsSupplier.addProductSupplier = false;
            modifyProductsSupplier.productSupplier    = productSupplier; //making productSupplier in add modify form equal to the productSupplier in main form
            DialogResult result = modifyProductsSupplier.ShowDialog();   //show add modify products supplier form

            this.DisplayProductSupplier();
            this.DisplayPackages();
            this.DisplayPackageProdSup();
        }
        //add button clicked in prodcuts supplier tab
        private void btnAddProductSupplier_Click(object sender, EventArgs e)
        {
            AddModifyProductsSupplier addProductsSupplier = new AddModifyProductsSupplier();

            addProductsSupplier.addProductSupplier = true;
            DialogResult result = addProductsSupplier.ShowDialog(); //showing add modify from for product supplier

            if (result == DialogResult.OK)                          // if user clicks accept
            {
                productSupplier = addProductsSupplier.productSupplier;
                this.DisplayProductSupplier();
                this.DisplayPackages();
                this.DisplayPackageProdSup();
            }
        }