Changing the directory in a method and call variable elsewhere

Hi i am attempting to change the directory in a method in my program and i was wondering how i would then use the variable from the method to say that the directory has changed in a start screen method

 static void choice4()
        {
            Console.WriteLine("Please enter a new directory to go to: ");
            string newDirectory = Console.ReadLine();
            try
            {

                Directory.SetCurrentDirectory(newDirectory);

            }
            catch (DirectoryNotFoundException n)
            {

                Console.WriteLine("The Directory {0} does not exist", n);

            }
           
            Console.WriteLine("Root directory: {0}", Directory.GetDirectoryRoot(newDirectory));
            Console.WriteLine("Current directory: {0}", Directory.GetCurrentDirectory());

            Console.ReadLine();
            Console.Clear();

            startscreen();
        } 

any help would be much appreciated