private void BtnSalesAdd_Click(object sender, EventArgs e) { string name = tbProdName.Text; int stock = Convert.ToInt32(tbProdStock.Text); bool ifThere = false; foreach (Product p in ProductManagment.ProductsDEPOT) { if (p.Name == name && p.Stocks >= stock) { p.Stocks -= stock; managment.UPDATEprodStockDepot(name); double price = p.Price; int sold = 0; string category = "SALES"; Product pS = new Product(name, price, stock, sold, category, 0); ProductManagment.ProductsSales.Add(pS); conn.AddProductToDB(pS); MessageBox.Show("Done!"); managment.AddProductinSALES(pS); ifThere = true; } } if (ifThere == false) { MessageBox.Show("Product not found or not enough stock!"); } }