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Posted 27 Nov 2011

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N-Tier: Begginer's guide in designing their application

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4.73/5 (23 votes)
25 Dec 2011CPOL
A great way to design your own application is to use the N-tier architecture.

This is just a simple tip that I will share and it is for you to check out.

Note: The following layers are exposed as different projects under one solution.

Object Layer: Create a class with properties:
public class Person
   public string Firstname {get;set;}
   public string Lastname {get;set;}
   public int Age {get;set;}

Data Access Layer: The layer that interacts with database:

public sealed class PersonDAL
   Person person = new Person();
   public static int GetAge(string firstname, string lastname)
         SQLConnection sqlcon = new SQLConnection(ConfigurationManager
         SQLCommand sqlcmd = new SQLCommand("SELECT age FROM Person_tb WHERE
                               firstname=@firstname AND lastname=@lastname",
         sqlcmd.CommandType = CommandType.CommandText;
         sqlcmd.Parameters.AddWithValue("@firstname", firstname);
         sqlcmd.Parameters.AddWithValue("@lastname", lastname);
         int retval = (int)sqlcmd.ExecuteScalar();
      catch(Exception ex)
         //Log ex
         sqlcon = null;

Business Logic Layer: The layer that serves as bridge for DAL and Application Layer:

public sealed class PersonBLL
   public static int GetAge(string firstname, string lastname)
      return PersonDAL.GetAge(firstname, lastname);

Application/Presentation Layer: The layer where users input data:

Person person = new Person();
person.Firstname = "Eduard";
person.Lastname = "Lu";

string firstname = person.Firstname;
string lastname = person.Lastname;

txtAge.Text = PersonBLL.GetAge(firstname, lastname).ToString();

There are still a lot of ways to optimize this one. You can add more layers which your application might be needing. For example, add a Utilities Layer wherein you can place your configuration/settings and your error/transaction logger. In my example, you can create a function that will return the connection string for your application to communicate with your database server.

Also, creating stored procedure is better than using command text. In my example, I used command text just to show you my query.

Message me if you have concerns. :)


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Comments and Discussions

General[My vote of 1] [My vote of 1] Pin
CelPlusPlus12-Sep-14 7:06
MemberCelPlusPlus12-Sep-14 7:06 
QuestionThose aren't tiers Pin
PIEBALDconsult5-Apr-12 5:33
professionalPIEBALDconsult5-Apr-12 5:33 
GeneralRe: thanks Reiss Pin
Eduard Lu28-Nov-11 22:00
MemberEduard Lu28-Nov-11 22:00 
GeneralRe: Good article btw, now voted Pin
Reiss28-Nov-11 21:54
professionalReiss28-Nov-11 21:54 
GeneralWe use this model exclusively, as highly detailed on Spaanja... Pin
EngleA20-Dec-11 5:06
MemberEngleA20-Dec-11 5:06 
GeneralMVP! MVP! MVP! I just got going on my next customer's projec... Pin
chuckamus_prime20-Dec-11 3:22
Memberchuckamus_prime20-Dec-11 3:22 
GeneralReason for my vote of 1 Short summary of the N-tier approach... Pin
DavidOwen19-Dec-11 18:59
MemberDavidOwen19-Dec-11 18:59 
GeneralI wonder why the presentation layer should know about the bu... Pin
bradut8-Dec-11 7:46
professionalbradut8-Dec-11 7:46 
GeneralReason for my vote of 5: Its precise and concise, should rea... Pin
Uday P.Singh5-Dec-11 20:43
MemberUday P.Singh5-Dec-11 20:43 
GeneralRe: thanks! :) Pin
Eduard Lu5-Dec-11 20:45
MemberEduard Lu5-Dec-11 20:45 
GeneralReason for my vote of 5 A practical example I needed to unde... Pin
Marius Coetzee5-Dec-11 17:40
MemberMarius Coetzee5-Dec-11 17:40 
GeneralRe: thanks! Pin
Eduard Lu5-Dec-11 20:31
MemberEduard Lu5-Dec-11 20:31 
GeneralReason for my vote of 5 exactly what i am looking for! thank... Pin
Aja wakim1-Dec-11 16:38
MemberAja wakim1-Dec-11 16:38 
GeneralRe: thanks aja Pin
Eduard Lu1-Dec-11 16:44
MemberEduard Lu1-Dec-11 16:44 
GeneralOne question, what's the reason to implementing a BLL? You c... Pin
Roberto Mazzone30-Nov-11 21:38
MemberRoberto Mazzone30-Nov-11 21:38 
GeneralRe: you can put your validation inside the BLL before returning ... Pin
Eduard Lu30-Nov-11 21:47
MemberEduard Lu30-Nov-11 21:47 
GeneralReason for my vote of 3 ok Pin
Ganesan Senthilvel30-Nov-11 15:20
MemberGanesan Senthilvel30-Nov-11 15:20 
GeneralReason for my vote of 5 Very nice... incredibly rudimentary,... Pin
BrianBissell30-Nov-11 6:54
MemberBrianBissell30-Nov-11 6:54 
GeneralRe: Thanks brian Pin
Eduard Lu30-Nov-11 14:16
MemberEduard Lu30-Nov-11 14:16 
GeneralReason for my vote of 1 :) Pin
Horváth Aladár29-Nov-11 23:05
MemberHorváth Aladár29-Nov-11 23:05 
GeneralRe: FYI. 1 is bad, 5 is good. Considering that your comment is a... Pin
fjdiewornncalwe30-Nov-11 3:45
professionalfjdiewornncalwe30-Nov-11 3:45 
GeneralRe: :) Pin
Eduard Lu30-Nov-11 14:15
MemberEduard Lu30-Nov-11 14:15 
GeneralThat is really a a nice to understand example.could you plea... Pin
Yashar_Khan29-Nov-11 19:39
MemberYashar_Khan29-Nov-11 19:39 
GeneralReason for my vote of 5 5 from me as well. Pin
fjdiewornncalwe29-Nov-11 10:03
professionalfjdiewornncalwe29-Nov-11 10:03 
GeneralRe: thanks Marcus Pin
Eduard Lu29-Nov-11 19:57
MemberEduard Lu29-Nov-11 19:57 

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