public static void ModifyProductList(List <Product> currentProductList) { string userInput; int itemSelected; bool startOver = false; do { Console.Clear(); Console.WriteLine("Welcome to the administrative options.\n\nIf you would like to add an item, type in \"add\"\nIf you would like to remove an item, type in \"remove\""); userInput = Validation.AddOrRemove(Console.ReadLine()); if (userInput.ToLower() == "add") { string name, category, description; decimal price = 0m; bool taxable; Console.Clear(); Console.WriteLine("In order to create a new item, you will need to enter the following:\na Name, the Price per Item, a Category, and whether the item is Taxable or not"); Console.WriteLine("\nWhat is the name of the new product"); name = Validation.ValidString(Console.ReadLine()); Console.WriteLine("\nWhat is the description of the new product"); description = Validation.ValidString(Console.ReadLine()); Console.WriteLine("\nWhat is the price of the new product"); price = Validation.ValidDecimal(Console.ReadLine()); Console.WriteLine("\nWhat is the category of the new product"); category = Validation.ValidCat(Console.ReadLine()); Console.WriteLine("\nIs the new product taxable? (Please enter \"yes\" or \"no\")"); taxable = Validation.YesOrNo(Console.ReadLine()); StreamWriter sw = new StreamWriter(@"..\..\..\ProductDB.txt", true); sw.WriteLine(); sw.Write($"{name},{price},{category},{taxable},{description}"); sw.Close(); Console.WriteLine("\nItem has been added. Returning to the Main Menu"); } else if (userInput.ToLower() == "remove") { Program.DisplayItems(currentProductList); Console.WriteLine("What item do you want to remove (Enter the number to the left of the item)"); itemSelected = Validation.ValItemFromList(Console.ReadLine(), currentProductList.Count); Console.WriteLine($"You are about to remove item {itemSelected}.) {currentProductList[itemSelected-1].Name} are you sure?\nIf yes, retype the administrative password, otherwise, type in cancel."); userInput = Console.ReadLine(); if (userInput == "gcAdmin") { currentProductList.RemoveAt(itemSelected - 1); StreamWriter sw = new StreamWriter(@"..\..\..\ProductDB.txt"); foreach (var product in currentProductList) { sw.WriteLine($"{product.Name},{product.PriceEach},{product.Category},{product.IsTaxable}, {product.Description}"); } sw.Close(); Console.WriteLine("The Item has been removed. Returning to Main Menu"); System.Threading.Thread.Sleep(5000); startOver = false; } else { startOver = true; } } else { Console.WriteLine("Input incorrect, please type in add or remove"); startOver = true; } } while (startOver == true); }