Inheritence Problem -- Constructors

Question

I apologize if this thread has been posted before--the Search link is currently not working. From my understanding, when you have a derived class, the constructors, by default, call the DEFAULT BASE CONSTRUCTOR. When I try and make constructors that don't have the same number of arguements as one of the base constructors, I get an error. Something like "no constructor in Base with arguements". This is a problem because, for example, I'm doing DirectX 9 coding. I have a class "SurfaceObject" which creates a blank blittable surface, and a (derived) class BitmapObject that contains many of the same methods, but none of the same constructors. Eg. The BitmapObject constructors take in a filename of some sort, but the SurfaceObjects don't--they're blank. How do I work around this? Will virtal methods or interfaces work? Example (non-working): Public class Base { public Base(int x) { System.Console.WriteLine("X: " + x); } } Public class Derived : Base { public Derived(int x, int y) { // Error: No constructor of class Base takes 2 arguements System.Console.WriteLine("Y: " + y); } }