//LinkedList helper method
        private static void LinkedList()
        {
            bool inLinkedListClass = true;

            while (inLinkedListClass == true) //user stays in LinkedList Class until set to false
            {
                Console.WriteLine("Welcome to the LinkedList class!");
                Console.WriteLine();
                GenericLinkedList <string> myList = new GenericLinkedList <string>();
                Console.Write("Your LinkedList is empty. Enter the value of the first item to begin: "); //the first operation on the LinkedList must be Add
                string entry = Console.ReadLine();
                myList.Add(entry);
                Console.WriteLine();
                Console.WriteLine("Item added!");
                Console.WriteLine("--------------------------------------------------------------------------------");
                bool inLinkedList = true;
                while (inLinkedList == true) //user stays in the LinkedList operations loop until set to false
                {
                    Console.WriteLine();
                    Console.WriteLine("The operations below are available in the LinkedList class: ");
                    Console.WriteLine("1. Add (This adds an item)");
                    Console.WriteLine("2. Remove (This removes an item)");
                    Console.WriteLine("3. Check (This checks if an item is present)");
                    Console.WriteLine("4. Search (This searches for an item)");
                    Console.WriteLine("5. IsEmpty (This checks if the list is empty)");
                    Console.WriteLine("6. Size (This shows the number of items in the LinkedList)");
                    Console.WriteLine("7. Insert (This adds an item at a specified position)");
                    Console.WriteLine("8. Index (This returns the index of an item)");
                    Console.WriteLine("9. Exit LinkedList class menu");
                    Console.WriteLine();
                    Console.Write("Please select an operation: ");
                    string selection = Console.ReadLine();

                    if (selection == "1") //selection to Add item
                    {
                        Console.Write("Please enter a value to add: ");
                        entry = Console.ReadLine();
                        int size = myList.Add(entry);
                        Console.WriteLine();
                        Console.WriteLine("Item added!");
                        Console.WriteLine();
                        Console.Write("To see the current list size, enter SIZE. To ignore, enter SKIP: "); //user can optionally view current LinkedList size
                        string returnSize = Console.ReadLine().ToUpper();
                        Console.WriteLine();
                        if (returnSize == "SIZE")
                        {
                            Console.WriteLine($"The LinkedList currently has {size} items in it!");
                        }
                        else
                        {
                            Console.WriteLine("You decided to skip.");
                        }
                        Console.WriteLine("--------------------------------------------------------------------------------");
                    }
                    else if (selection == "2") //selection to Remove a specified item
                    {
                        Console.Write("Please enter a value to remove: ");
                        entry = Console.ReadLine();
                        bool removed = myList.Remove(entry);
                        Console.WriteLine();
                        if (removed == true) //program will indicate whether the item was removed or not found
                        {
                            Console.WriteLine("Item removed!");
                        }
                        else
                        {
                            Console.WriteLine($"Your entry, {entry} was not found in the LinkedList!");
                        }
                        Console.WriteLine("--------------------------------------------------------------------------------");
                    }
                    else if (selection == "3") //selection to check that an item exists in the List
                    {
                        Console.Write("Please enter a value to check: ");
                        entry = Console.ReadLine();
                        bool isPresent = myList.Check(entry);
                        Console.WriteLine();
                        if (isPresent == true)
                        {
                            Console.WriteLine($"{entry} is present in the LinkedList.");
                        }
                        else
                        {
                            Console.WriteLine($"{entry} does not exist in the LinkedList.");
                        }
                        Console.WriteLine("--------------------------------------------------------------------------------");
                    }
                    else if (selection == "4") //selection to search that an item exists in the List and returns the item's value
                    {
                        Console.Write("Please enter a value to search: ");
                        entry = Console.ReadLine();
                        Console.WriteLine();
                        myList.Search(entry);
                        Console.WriteLine("--------------------------------------------------------------------------------");
                    }
                    else if (selection == "5") //selection to know if the LinkedList is empty
                    {
                        bool isEmpty = myList.IsEmpty();
                        Console.WriteLine();
                        if (isEmpty == true)
                        {
                            Console.WriteLine("The LinkedList is empty.");
                        }
                        else
                        {
                            Console.WriteLine("The LinkedList is not empty.");
                        }
                        Console.WriteLine("--------------------------------------------------------------------------------");
                    }
                    else if (selection == "6") // selection to know the number of items in the LinkedList
                    {
                        int listSize = myList.Size();
                        Console.WriteLine();
                        Console.WriteLine($"There are {listSize} items currently present in the LinkedList.");
                        Console.WriteLine("--------------------------------------------------------------------------------");
                    }
                    else if (selection == "7") // selection to insert a specified item value as a node at the specified index
                    {
                        Console.Write("Please enter a value to insert: ");
                        entry = Console.ReadLine();
                        Console.WriteLine();
                        Console.Write("Please enter the desired insert position: ");
                        int entryPosition = int.Parse(Console.ReadLine());
                        Console.WriteLine();
                        myList.Insert(entry, entryPosition);
                        Console.WriteLine("Item inserted!");
                        Console.WriteLine("--------------------------------------------------------------------------------");
                    }
                    else if (selection == "8") // selection to know an item's index
                    {
                        Console.Write("Please enter the query item value: ");
                        entry = Console.ReadLine();
                        Console.WriteLine();
                        int index = myList.Index(entry);
                        if (index == -1)
                        {
                            Console.WriteLine($"The query item, {entry} does not exist in the LinkedList.");
                        }
                        else
                        {
                            Console.WriteLine($"The query item, {entry} is at index {index} in the LinkedList.");
                        }
                        Console.WriteLine("--------------------------------------------------------------------------------");
                    }
                    else if (selection == "9") // selection to exit the LinkedList operations loop
                    {
                        inLinkedList = false;
                    }
                    else
                    {
                        Console.WriteLine("Wrong selection. Try again.");
                    }
                }
                Console.WriteLine();
                Console.Write("To continue into the LinkedList class menu, enter YES. To exit the LinkedList class, enter NO: ");
                string inClass = Console.ReadLine().ToUpper();
                if (inClass != "YES") // any string other than "YES" will exit the LinkedList class
                {
                    inLinkedListClass = false;
                }
            }
        }