Architecture :: Design Pattern And Tier Architecture

Jun 12, 2010

I am a newbie to and work in a firm where the projects are quite small.

I was told by my manager that in a few weeks or so we would be getting a bigger project and I need to be well versed with Design Patterns and N tier arcihtecture.

I would really appreciate if someone could provide me some links and also drop me a few sentences on how this things are useful?

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Dec 25, 2010

recently i've studied on ADO.NET's Entity Model Framework and say 'wow' as ORM is one of the fevourite pattern i practice..but suddenly i've come to an ambiguous situation when i'm going to start. i usually follow the following 3-tier architecture..

1. UI Layer
2. BLL - business logic layer
3. DAL - Data Access Layer
a. DTO / DAO
b. Gateway (contains the sql query/stored procedure and connection with DB)

now when i'm going to use the Entity Model Design,where the DBML/ .edmx File should be placed? Because many a times i'm using the DBML file as DTO because of the mapped objects.. in the same time, sometimes DBML ( .edmx file in .NET 4.0) contains CRUD methods and stored procedured method as well as methods with different selection operations,- which should be in Gateway. so where the .edmx file should be placed !?!! IN DTO namespace !? or in Gateway namespace!

moreover sometimes there is no need for the BLL which breaks the rules of inter-layer-communication (UI > BLL > DAL.Gateway)! what makes me confuse is, what should be the ideal n-tier architecture when i'll use the ADO.NET Entity Model Design Framework

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Architecture :: Which Design Pattern Can Be Implemented?

Mar 22, 2011

suggest me a good design pattern for implmenting the following? I have an object say myObject. This myObject is created using few inputs from the UI. After the creation of myObject. This object will be passed to few methods.. like method1(myObject);

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Architecture :: What Basically Is Factory Design Pattern

Jul 17, 2010

I visited this Link to study about Factory design pattern. But i am confused about it still. What i understood is that we must use an Interface to define a class .In the interface we will give the prototype of functions and later on we will define it in concrete class. Is that simple concept is Factory design pattern ?

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Architecture :: Good Design Pattern For Forum Development?

Jan 12, 2011

i want to know which design pattern is good for forums web site design

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Architecture :: Asynchronous Page Processing In 3 Tier Architecture?

Jul 30, 2010

I am working on 3 tier architecture: UI, BL, DAL. In my UI i have following code for Asynchronous page processing:


But I want a database fetch operation to be performed in this asyncronous method. And due to 3 tier arch. i am unable to do this in UI Layer. Can anyone guide me that how can I implement Asynchronous processing in 3 tier architecture? Note: If you are going to place EndAsyncWork1 in DAL then show that how can I return a value back to UI layer from this function.


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Architecture :: What Is The Difference In 3-tier Architecture And Gereral Way Of Programming

May 20, 2010

I want to know that What are the factors if we use methods on each .cs page for connection and executing query on each aspx code behind page rather then using BAL .

How our application get affected in terms of performance and speed or other way?

when we put our website on server after publish/compile in general approach (using query in C# code behind) rathor than using stored procedures?

then which logic is better and why ?

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Architecture :: Function Implementation In 3-tier Architecture?

Apr 28, 2010

I have implemented the 3-tier architecture project; DAL, BAL, and presentation layer are three layers in it. I am going to implement the following scenario:

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Architecture :: Exception Layer In N-tier Architecture?

May 13, 2010

I'm developing a n-tier architecture... I'm confused with handling exception in the layers... Is it a good practise to add a Exception Layer to the architecture.

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Architecture :: Trying To Use A 3-tier Architecture (UI, BAL & DAL) For Project?

Nov 30, 2010

I am trying to use a 3-tier architecture (UI, BAL & DAL) for my project. I have each of the tier in different physical machines.

UI - Machine 1
BAL - Machine 2
DAL - Machine 3
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Architecture :: How To Create 3 Tier Architecture

Mar 29, 2011

I was tasked to create 3 tier web application. However, i browsed through many books & tutorials. The examples are doing it using Object data source which my lecturers claimed that it is not 3 tier at all. Shouldn't be dragging any data source into deisgn view. Any comprehensive examples for me to take reference from?

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Architecture :: How To Develop An App Using 3 Tier Architecture

Aug 18, 2010

i want to develop an application in using 3 tier architecture .

i know that there are three layers

Data layerBusiness Layer

Data Access LayerBusiness Logic Layer Presentation Layer. I am confused between Data Access Layer and Business Logic Layer.

In data access layer we develop the property classes and main class function which returns datasets, datatables and data reader to Presentation layer.

what is the use of Business Logic Layer ? what actually we do in Business logic Layer
?? we can pass data directly from data access layer to presentation layer ?

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Architecture :: Namespace 3 Tier Architecture?

Feb 5, 2010

i am in the process of creating 3 tier architecture for with Microsoft Studio 2005.

My architerture is as below

Presentation Layer Business Logic Layer Data Access Layer

-------------------------- --------------------------- -------------------------------

Form1 BLTable1 DaTable1
(NameSpace = MyCompany.MyProject.BL. BLTable1) (NameSpace = MyCompany.MyProject.DA. DaTable1)
Form2 BLTable2 DaTable2
(NameSpace = MyCompany.MyProject.BL. BLTable2) (NameSpace =
MyCompany.MyProject.DA. DaTable2)
Form3 BLTable3 DaTable3
(NameSpace = MyCompany.MyProject.BL. BLTable3) (NameSpace = MyCompany.MyProject.DA. DaTable3)

I have 2 question here:

(1).MSDN say that we should not have the namespace where its name is same with class name but it does not exlpain why.Does anyone know why? The msdn page is

(2). Business Logic Layer BLTable1 need to interact with Data Access Layer
DaTable1 , so i put the code: imports MyCompany.MyProject.DA. DaTable1 inside
BLTable1, so that i can have access to all the public shared method inside
DaTable1 in BLTable1 for example : DaTable1.Save()

But problem arise when BLTable1 want to use the public shared method in BLTable2 .

I have put the code imports MyCompany.MyProject.BL. BLTable2 inside BLTable1,but i need to
key in the class name twice only can access to the public shared method inside
BLTable2 for example :BLTable2.BLTable2.Save.

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Architecture :: How To Create 3-tier Architecture

Sep 16, 2010

structure of 3-tier architrcture

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Architecture :: Implement N-tier Architecture?

Feb 19, 2011

some link of some articles for learning N-tier architecture ....

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Architecture :: How To Design A Centralized Business Or Service Authentication Architecture

Sep 22, 2010

i want to create a centralised business or Service authendication architecture in .net. for example, we have a clients like c1, c2, c3, c4, ... etc. everybody logins seperatly as well as grouply. ie, if client "C1" logins [with login authentication] he can access c2 , c3, c4 also without login authendication. So its like a google. if we enters gmail account, we can access orkut, picasa like that.. i need the cetralised architecture.

And, client "c1" seperately asks seperately how will be the authendication architecture.

so give me the single solution for both these two scenarios. how will be the architecture for these two and how is the Data Base (Login) Structure.

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Architecture :: How The Data Pass From One Layer To Another Layer In Mvc Design Pattern

Apr 1, 2010

how the data pass from one layer to another layer in mvc design pattern...

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Architecture :: Is Layered Architecture A Pattern

Mar 2, 2010

guide in typical 4 layered architecture (having User Interface, Custom Types, Business Logic, Data Access Layer) do we follow some design pattern ? I am not clear what pattern it is or what pattern it should be called.

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Architecture :: Create architecture design For WCF Service?

Aug 10, 2010

I am try to create architecture design for WCF service.

We have WCF service that we have to expose to third party so then can request with xml and get back xml response.

The wcf service should do the following:

- Accept the request call with xml

- Check xml against the schema

- Parse the xml

- Authenticate the incoming xml by username and password that will be in xml

- Send back the response

If anybody can let me know what kind of design I can use or is there any pattern available that I can take it and then extend it as per my requirement.

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Architecture :: Architecture And Design Patterns?

Mar 16, 2011

hat is the difference between Architecture and Design patterns ?

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C# - Web App Using A 3-tier Design Pattern, One Of The Bottom Layers Provide Some Checking Mechanism To Ensure...?

Feb 17, 2010

I'm trying to write a web app using 4-tier design pattern ( Data Store, DAL, BLL and UI).
Among other things this app would also implement a forum.

Suppose I want to move a thread from one forum to another. In order to do this, UI layer must pass down to other layers the ID of a thread and the ID of a forum to which I wish to move this thread ( UI would pass these parameters by calling method A in BLL layer and A would in turn call method B in DAL layer... ).

a) Now should one of the bottom layers provide some sort of checking mechanism to ensure that the two ID arguments supplied by UI layer really represent an existing thread and an existing forum or is it the responsibility of UI layer to provide valid ID values?


I would consider the ability to pass invalid IDs a bug.

Should non existing ID be considered a bug just in the case of moving a thread, or also in the case of displaying a thread. Thus when user navigates to page Showthread.aspx?ID={0}, if query string parameter ID references non existing ID, If none of the layers check for the validity of ID, then GridView simply won't display any

"But in this case it doesn't look like the ids are in any sort of list. If they were one could only assume that this would never happen as I assume the lists would be populated by a stored procedure or a DAL procedure that pulls all valid IDs."

But even if user chooses IDs from a set of list, by the time it posts the page back, the DB table containing this ID could be changed in the mean time by admin or whomever?!

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What Is The Use Of 3-Tier Architecture

Oct 7, 2010

What is the use of 3-Tier Architecture?

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What Is Tier Architecture And MVC

Dec 27, 2010

What is tier architecture and MVC for ASP.NET?

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How To Develop 3 Tier Architecture In Using C#

May 31, 2010

can any one tell about 3 tier architecture in using C#How can i develop a project using 3 tier?

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What Is The Difference Between N-Tier And SOA Architecture

Aug 15, 2010

As per my understanding regarding N-Tier and SOA architecture.


N-Tier means dividing application into layers, Example I am developing application in and I pushed total DB Layer to WCF then it is called N-tier.[Tightly coupled]

SOA[Loosely coupled]

As per my understanding regarding SOA its very generic term and how well we going to loosely couple our architecture then its called SOA. Best example for SOA services - Stock feeds/ weather feeds.

My conclusion:

Even though if we develop application using WCF it does not mean its SOA if it is tightly couple with single client/ or .net applications only can understand about services.

Can you help me in understanding of SOA VS N-Tier.

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