MVC Application Using n-tier Architecture

• Create classes to process all the requests from Business Service Layer.
• Write necessary methods to process the requests in business service layer.
  
  1. public class RegisterCustomerDataAccessLayer {#region Register Customer
  2. public bool RegisterCustomer(string firstName, string lastName, string email, string phoneNumber, string password)
  3. {
  4. try {
  5. using(var dbContext = new SampleCustomerInformationEntities())
  6. {
  7. CustomerInformation newCustomer = new CustomerInformation();
  8. newCustomer.CustomerID = 2;
  9. newCustomer.First_Name = firstName;
  10. newCustomer.Last_Name = lastName;
  11. newCustomer.Email = email;
  12. newCustomer.Phone = phoneNumber;
  13. newCustomer.Password = password;
  14. newCustomer.User_Name = email;
  15. dbContext.CustomerInformations.Add(newCustomer);
  16. dbContext.SaveChanges();
  17. return true;
  18. }
  19. } catch (Exception ex)
  20. {
  21. throw new Exception(ex.Message);
  22. }
  23. }#endregion
  24. }
  26. public class CustomerLoginDataAccessLayer
  27. {#region Customer Login
  28. public bool LoginCustomer(string userName, string loginPassword)
  29. {
  30. try {
  31. using(var dbContext = new SampleCustomerInformationEntities())
  32. {
  33. CustomerInformation customer = new CustomerInformation();
  34. customer = dbContext.CustomerInformations.FirstOrDefault(x => x.User_Name == userName && x.Password == loginPassword);
  35. if (customer != null)
  36. return true;
  37. else
  38. return false;
  39. }
  40. } catch (Exception ex)
  41. {
  42. throw new Exception(ex.Message);
  43. }
  44. }#endregion
  45. }

Module 4:

Add another project to the solution for writing business logic. Create a WCF Service Library.

A Service Contract defines what all the methods or operations available to the client from service endpoint. A service contract is an interface and it tells the client what service can do.

An Operation Contract is defined within the service contract and it has return type and parameters. Those operation contracts are implemented in the class which extends the service interface. Client can use this method to do operations.

A Data Contract describes the information which needs to be exchanged and it can be used in any operation contract as a parameter or return type. Based on the parameters and return types the data will be serialized/de-serialized to or from (Binary ó XML).

A Data Member attribute needs to be applied all the members of the data contract to indicate it as a data member, which means it should be serialized.

More information about Service Contracts can be found here: Designing Service Contracts.
More information about Data Contracts can be found here: Using Data Contracts.

• Write necessary operation contracts to make available for Presentation Layer.
• Use all the available methods from Data Access Layer to process data in Service Layer.

• Right click on the references folder in the client side.
• Click Add Service Reference.
• Service reference can be found by entering the endpoint url or by clicking Discover.
• Select the necessary service references and all the service contracts and operation contracts available can be accessed.
  
  Detailed information about consuming web service can be found here: Consuming Web Service.

Controller: Use all the available methods from service layer and process the requests,