/*Display boxs combobox*/ private void Displayboxs() { Category[] category_arr; category_arr = Category_data.GetCategory(); //category data products = product_data.GetproductData(); //product data displaysupplier.Items.Clear(); //clear suppliers Supplier[] supplierinfo = Supplier_data.Getsupplierinfo(); //get supplier data foreach (Supplier i in supplierinfo) { displaysupplier.Items.Add(i.Name);//add supplier name to box } display_category.Items.Clear(); /*getting data category and add it to the cells*/ foreach (Category i in category_arr) { display_category.Items.Add(i.Name.ToString());//add to category box name of category } }