// C# program to print the name of those 

// employees whose name contain more 

// than 4 characters in lowercase 

using System; 

using System.Linq; 

using System.Collections.Generic; 

// Employee details 

public class CustomerBusinessLogic

{

    ICustomerDataAccess _dataAccess;

​

    public CustomerBusinessLogic(ICustomerDataAccess custDataAccess)

    {

        _dataAccess = custDataAccess;

    }

​

    public CustomerBusinessLogic()

    {

        _dataAccess = new CustomerDataAccess();

    }

​

    public string ProcessCustomerData(int id)

    {

        return _dataAccess.GetCustomerName(id);

    }

}

​

public interface ICustomerDataAccess

{

    string GetCustomerName(int id);

}

​

public class CustomerDataAccess: ICustomerDataAccess

{

    public CustomerDataAccess()

    {

    }

​

    public string GetCustomerName(int id) 

    {

        //get the customer name from the db in real application        

        return "Dummy Customer Name"; 

    }

}

​

public class CustomerService

{

    CustomerBusinessLogic _customerBL;

​

    public CustomerService()

    {

        _customerBL = new CustomerBusinessLogic(new CustomerDataAccess());

    }

​

    public string GetCustomerName(int id) {

        return _customerBL.ProcessCustomerData(id);

    }

    public static void Main()

    {

        CustomerService obj = new CustomerService();

        string name = obj.GetCustomerName(1);

        Console.WriteLine(name);

    }

}

​

​

​

​