checking keyboard events

[2playgames]

hi. i'm quite new to game programming with .NET and C#. I've done some stuff with forms and buttons but this is still a bit hard for me.

so, what i want to do is make the camera move when the players presses a key. i've made these codes:

directly in the class:

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static EventProcesser ep;

event processer class

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public class EventProcesser : Irrlicht.IEventReceiver
	{
		private bool[] keyboard_down;
		
		public EventProcesser()
		{
		}
		
		public bool OnEvent(Event e) {
			if (e.Type == EventType.KeyInput)
			{
				keyboard_down[(int) e.Key] = e.KeyPressedDown;
				return true;
			}
			return false;
		}
		
		public bool KeyDown(KeyCode k) {
			return keyboard_down[(int) k];
		}

	}

// main

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// events
			ep = new EventProcesser();
			device.EventReceiver = ep;

// game loop

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// move the camera
			if(ep.KeyDown(KeyCode.KEY_UP)) { // THIS LINE
				camera_position.Y -= 1;
			}
			if(ep.KeyDown(KeyCode.KEY_DOWN)) {
				camera_position.Y += 1;
			}

however, when i run the game i get an error on the line marked with "THIS LINE"

Exception System.NullReferenceException was thrown in debugee:
Object reference not set to an instance of an object.

anyone care to help an OOP and Irrlicht noob? many thanks in advance

EDIT: on a side note, i don't really understand what 'static' does. i only know that i need to call some of the vars in my main class (e.g. 'device') from other classes directly

[Yeurl]

because private bool[] keyboard_down is not initiate