private void interfaceLinqXElement()
            {
                Console.WriteLine();
                Console.WriteLine("Reading XML > Read using LINQ and XElement Class");
                Console.WriteLine("================================================");
                Console.WriteLine("1. Select XPath (Single)");
                Console.WriteLine("2. Select LINQ (Single)");
                Console.WriteLine("3. Select XPath (Multiple)");
                Console.WriteLine("4. Select LINQ (Multiple)");
                var input = Console.ReadLine();

                switch (input)
                {
                case "1":
                    LinqXElementHelper.GetInstance().SelectSingleXPath();
                    break;

                case "2":
                    LinqXElementHelper.GetInstance().SelectSingleLinq();
                    break;

                case "3":
                    LinqXElementHelper.GetInstance().SelectMultipleXPath();
                    break;

                case "4":
                    LinqXElementHelper.GetInstance().SelectMultipleLinq();
                    break;
                }
            }
            private void interfaceLinqXElement()
            {
                Console.WriteLine("Writing XML > Write using XDocument Class");
                Console.WriteLine("===========");
                Console.WriteLine("1. Write XDocument");
                Console.WriteLine("2. Write XElement");
                Console.WriteLine("3. Add Element using Constructor");
                Console.WriteLine("4. Add Element by Cloning");
                Console.WriteLine("5. Update Element");
                Console.WriteLine("6. Delete Element");
                Console.Write("Select: ");
                var input = Console.ReadLine();

                switch (input)
                {
                case "1":
                    LinqXElementHelper.GetInstance().WriteXDocument();
                    break;

                case "2":
                    LinqXElementHelper.GetInstance().WriteXElement();
                    break;

                case "3":
                    LinqXElementHelper.GetInstance().AddElementConstructor();
                    break;

                case "4":
                    LinqXElementHelper.GetInstance().AddElementCloning();
                    break;

                case "5":
                    LinqXElementHelper.GetInstance().UpdateElement();
                    break;

                case "6":
                    LinqXElementHelper.GetInstance().DeleteElement();
                    break;
                }
            }