c# virtual vs abstract
public abstract class E
{
public abstract void AbstractMethod(int i);
public virtual void VirtualMethod(int i)
{
// Default implementation which can be overridden by subclasses.
}
}
public class D : E
{
public override void AbstractMethod(int i)
{
// You HAVE to override this method
}
public override void VirtualMethod(int i)
{
// You are allowed to override this method.
}
}