Create a method to dump the data to the screen

The method

The following method will cycle through each Character, Place and Item and display all of the data for each:

private static void DumpData(List<Character> characters, List<Item> items, List<Place> places)
        {
            foreach(Character C in characters)
            {
                Console.Write(C.ID +" ");
                Console.Write(C.Name + " ");
                Console.Write(C.Description + " ");
                Console.WriteLine(C.CurrentLocation);
            }

            foreach(Place P in places)
            {
                Console.Write(P.id + " ");
                Console.Write(P.Description + " ");
                Console.Write(P.North + " ");
                Console.Write(P.East + " ");
                Console.Write(P.South + " ");
                Console.Write(P.West + " ");
                Console.Write(P.Up + " ");
                Console.WriteLine(P.Down);
            }

            foreach(Item I in items)
            {
                Console.Write(I.ID + " ");
                Console.Write(I.Description + " ");
                Console.Write(I.Status + " ");
                Console.Write(I.Location+ " ");
                Console.Write(I.Name + " ");
                Console.Write(I.Commands + " ");
                Console.WriteLine(I.Results);
            }
        }

Using the Method

Dump Data during Game

You could add a command to the switch case statement in playgame:

case "quit":
    Say("You decide to give up, try again another time.");
    stopGame = true;
    break;
default:
    Console.WriteLine("Sorry, you don't know how to " + Command + ".");
    break;

find the code above and add a new case:

case "quit":
    Say("You decide to give up, try again another time.");
    stopGame = true;
    break;
case "dump":
    DumpData(characters, items, places);
    break;
default:
    Console.WriteLine("Sorry, you don't know how to " + Command + ".");
    break;

Dump Data at Start

Add this code as a method into your program. Now we need to run it so in main method so change:

 if (LoadGame(filename, characters, items, places))
            {
                PlayGame(characters, items, places);
            }

to add the extra code before PlayGame is called:

 if (LoadGame(filename, characters, items, places))
            {
                Console.WriteLine("Do you want to dump the data??");
                string choice = Console.ReadLine();
                if (choice == "yes")
                    DumpData(characters, items, places);

                PlayGame(characters, items, places);
            }