public void menu() { int choice; bool b; do { System.Console.WriteLine("1. Add Product"); System.Console.WriteLine("2. Show product"); System.Console.WriteLine("3. Show Product By ID"); System.Console.WriteLine("4. Delete Product"); System.Console.WriteLine("5. Update Prroduct"); System.Console.WriteLine("6. Exit"); b = int.TryParse(System.Console.ReadLine(), out choice); if (b == true) { switch (choice) { case 1: AddProduct(); // calling AddProduct Method declared Locally break; case 2: DisplayProducts(); // calling DisplayProducts Method declared Locally break; case 3: GetProductByID(); break; // calling GetProductByID Method declared Locally case 4: RemoveProduct(); break; // calling RemoveProduct Method declared Locally case 5: UpdateProduct(); // calling update Method declared Locally break; default: System.Console.WriteLine("Please Enter the Correct Option"); break; } } else { System.Console.WriteLine("Please Enter the only digits"); } } while (choice != 6); //local function to add products into List void AddProduct() { Product product = new Product(); // creating the object for Product class ProductBusiness pb = new ProductBusiness(); // Creating thhe object for ProductBusiness class bool check1 = false; do { try { System.Console.WriteLine("enter the ProductId"); System.Console.WriteLine("Product ID must start with PID and should be less than 6"); product.ProductID = System.Console.ReadLine(); if (pb.CheckProductID(product.ProductID) == false) //checking whether the productId avaliable in the list or not to enter unique productId into list { check1 = true; System.Console.WriteLine("enter the ProductName:"); System.Console.WriteLine("ProductName must Contain only alphabets"); product.ProductName = System.Console.ReadLine(); System.Console.WriteLine("enter the Productprice:"); product.Price = System.Convert.ToDouble(System.Console.ReadLine()); pb.AddProducts(product); //adding the products into the List System.Console.WriteLine("Product Added Sucessfully!!!"); } } catch (ProductException e) { System.Console.WriteLine(e.Message); } } while (check1 == false); } // Local Function to Dispaly Product Details void DisplayProducts() { ProductBusiness pb = new ProductBusiness();// Creating object for ProductBusiness class List <Product> prodts = pb.DispalyProducts(); System.Console.WriteLine("===============Product Details============="); System.Console.WriteLine("ProductName" + " " + "ProductID" + " " + "ProductPrice"); System.Console.WriteLine("-----------------------------------------------------------------------"); foreach (Product item in prodts) { System.Console.WriteLine(item.ProductName + " " + item.ProductID + " " + item.Price);// Displaying the products } } // Local function to remove a Product form List void RemoveProduct() { Product Product = new Product(); // creating the object fro Product class ProductBusiness pb = new ProductBusiness(); // Creating object for ProductBusiness class bool check1 = false; do { try { System.Console.Write("Enter the ProductID to be Deleted:"); System.Console.WriteLine("Product ID must start with PID and should be less than 6"); string id = System.Console.ReadLine(); if (pb.CheckProductID(id) == true)//checking whether the productId avaliable in the list or not { check1 = true; pb.RemoveProduct(id); System.Console.WriteLine("Product Removed"); } else { System.Console.WriteLine("ProductID does not Exixts"); } } catch (Exception e) { System.Console.WriteLine(e.Message); } } while (check1 == false); } // local Function to get details of Product by Id void GetProductByID() { ProductBusiness pb = new ProductBusiness(); // Creating object for ProductBusiness class bool check1 = false; do { try { System.Console.Write("Enter the ProductID: "); System.Console.WriteLine("Product ID must start with PID and should be less than 6"); string productID = System.Console.ReadLine(); if (pb.CheckProductID(productID)) { check1 = true; Product pe = pb.GetProductByProductID(productID); System.Console.WriteLine(pe.ProductID + " " + pe.ProductName + " " + pe.Price); } else { throw new ProductException("ProductID Does not Exsits"); } } catch (Exception e) { System.Console.WriteLine(e.Message); } } while (check1 == false); } // local function to update product details void UpdateProduct() { Product product = new Product(); // creating the object for Product class ProductBusiness pb = new ProductBusiness(); // Creating object for ProductBusiness class System.Console.WriteLine("1. Update Product Name"); System.Console.WriteLine("2. Update Product Price"); int option; System.Console.Write("enter your Choice: "); option = int.Parse(System.Console.ReadLine()); switch (option) { case 1: UpdateProductName(); break; case 2: UpdateProductPrice(); break; } // inner function to update a product name by using productID void UpdateProductName() { bool check1 = false; do { try { System.Console.WriteLine("Enter Existing Product ID"); System.Console.WriteLine("Product ID must start with PID and should be less than 6"); product.ProductID = System.Console.ReadLine(); if (pb.CheckProductID(product.ProductID))//checking whether the productId avaliable in the list or not { check1 = true; System.Console.WriteLine("Enter new name for Product"); System.Console.WriteLine("ProductName must Contain only alphabets"); product.ProductName = System.Console.ReadLine(); pb.UpdateProductName(product); System.Console.WriteLine("ProductName updated!!"); } else { throw new ProductException("ProductID does not Exixts"); } } catch (Exception e) { System.Console.WriteLine(e.Message); } } while (check1 == false); } // inner function to update a product price by using ProductID void UpdateProductPrice() { bool check1 = false; do { try { System.Console.WriteLine("Enter Existing Product ID"); System.Console.WriteLine("Product ID must start with PID and should be less than 6"); product.ProductID = System.Console.ReadLine(); if (pb.CheckProductID(product.ProductID))//checking whether the productId avaliable in the list or not { check1 = true; System.Console.WriteLine("Enter new Price for Product"); product.Price = System.Convert.ToDouble(System.Console.ReadLine()); pb.UpdateProductPrice(product); System.Console.WriteLine("Product Price Updated Sucessfully!!!"); } else { throw new ProductException("ProductID does not Exixts"); } } catch (Exception e) { System.Console.WriteLine(e.Message); } } while (check1 == false); } } }