public abstract class BaseThing
{
    public string Name { get; set; }
    public string Description { get; set; }
    public decimal Cost { get; set;}

    public abstract void MethodThatDoesThings()
    {

    }
}

public class DerivedThing
{
    Name = "Name1";
    Description = "Description1";
    Cost = 1.00;

    public override void MethodThatDoesThings()
    {
        //Actually does things
    }
}