Answer / rakesh

public interface IService<T>
{
int Add(T entity);
void Update(T entity);
}

public abstract class ServiceBase<T> : IService<T>
{
public int Add(T entity) { ... }
public void Update(T entity) { ... }
}

public interface ICarService : IService<Car>
{
}

public class SomeBaseClass : ServiceBase<Car>, ICarService
{
public int Add(Car entity);
public void Update(Car entity);
}

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