// Example 1 public interface ICarDal { void Delete(int carId); } // Example 2 public class CarDal : ICarDal { private readonly IDbConnection _connection; public CarDal(IDbConnection connection) { _connection = connection; } public void Delete(int carId) { var sqlCommand = new SqlCommand("DELETE FROM Cars WHERE Id = @Id", _connection); sqlCommand.Parameters.AddWithValue("@Id", carId); sqlCommand.ExecuteNonQuery(); } }In example 1, ICarDal interface has a Delete method which accepts an integer parameter representing the id of the car to delete. In example 2, a concrete class CarDal implements the ICarDal interface. It has a constructor that accepts an IDbConnection (which could be a SqlConnection or any other object that implements IDbConnection). The Delete method is implemented by creating an SQL DELETE command and executing it using the provided IDbConnection. The package/library used in these examples is not determined as it is not explicitly stated.