Visual Studio :: How Many Layers In LINQ Application
Apr 1, 2010
I have question about N-tier architecture. everyone about 3-Layer architecture these are:
1). UI Layer,
2). Business Layer,
3). Data Access Layer.
i already have worked on this.
Then i heard about LINQ to sql. how many layer an web application should contain.
As my knowledge. if i use LINQ to slq then i have to worked only 2-Layer:
- Data Acess/Business Layer: which contains only *.dbml files which is my database and
- UI Layer: which contains *.aspx files.
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Apr 1, 2010
I have question about N-tier architecture. everyone about 3-Layer architecture these are:1). UI Layer, 2). Business Layer, 3). Data Access Layer.i already have worked on this.Then i heard about LINQ to sql. please tell me how many layer an web application should contain. As my knowledge. if i use LINQ to slq then i have to worked only 2-Laye
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May 28, 2010
How can I ensure that web application converted from 2003 visual studio to 2008 visual studio
to have two files as it is when create a web file in visual studio 2008.The web application is in Chsarp. I have converted these filesfrom 2003 to 2008 but they still have three files each.
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Nov 18, 2010
I want to use Linq to SQL in my web projects. I mostly work in small and medium size projects. Please guide me what layers I should use ?
Previously I was using DAAB and was using 4 layers (business objects, business logic layer, data access layer and user interface).
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Mar 28, 2011
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Mar 4, 2010
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Mar 28, 2011
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Feb 22, 2010
I am not able to catch the databing mechanism when used with LINQ.I am able to populate the data correclty agaisnt my comboboxes. the thing I am not able to catch is when changing an item in the dropdownlist and set the focus on some other control in my form, the combobox resets to its original value. this way I am not able to send changes back to the database.ave you got any solution, or you need more explanation?:)
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Feb 3, 2010
How to remove the unused references in form level, vb.net application and web application?
How can I use fxcop to identity undisposed objects like dataset, dataview, connection, stream...? Any one having custom rules for the same?
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Apr 8, 2010
on desktop start has disappeared, getting above issue on double clicking/running any application.have VS2005 installed with sp1 and all other relevant updates as per MS..., i read some forums which states because of VC++ the system files may be currupted....have not installed VC++can anyone guide me the issue here and its solution...
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Jul 23, 2010
In some of my new websites under .NET 4.0 my Visual Studio does not recognize System.Linq as a valid class. I need to add a reference to System.Core in Web.Config to solve this but there are projects where this is not needed.
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Aug 14, 2010
is it possible to convert whole visual studio 2008 web site project to visual studio 2010 web site project
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Feb 25, 2011
how the WCF, DAO and DTO layers communicate with each other? I would appreciate if someone can specify which layer comes first and then how it interacts with the next layer
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Apr 19, 2010
I am using layered architecture in dotnet (mostly I work on web projects). I am confuse what layers should I use ?
I have small idea that there should be the following layers.
user interface
customer types (custom entities)
business logic layer
data access layer
My purpose is sure quality of work and maximum re-usability of code.
some one suggested to add common types layer in it. Please guide me what should be layers ? and in each layer what part should go ?
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Nov 4, 2010
While designing (and then implementing) a layered application:
Is it correct to use the same ORM objects accross all layers? (which would go against encapsulation).
Or the presentation, business and data layer should each have their own objects? (which would lead to lots of code repetition).
e.g. (just to illustrate the question): if one uses Linq to SQL in the Data Layer and Visual Studio's O/R designer to generate the ORM objects, are those objects supposed to be used in the Business and Presentation Layers as well.
i.e.: Are the objects associated with the entities that the application handles a crosscutting issue?
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Jul 25, 2010
I have an MVC 2 web application which uses models auto-generated by LINQ. When I add a Silverlight project to my solution, generating a new strongly-typed View fails with the message:
Compiling transformation: The type or namespace name 'Data' does not exist in the namespace 'System' (are you missing an assembly reference?). I understand this is most likely because Silverlight does not access the System.Data namespace (at least, I can't add the reference to my Silverlight app). However, it's not really important - I'm just trying to generate an .aspx View at this stage, not a Silverlight View.
Is there any way to get this template generation to work, or do I have to create my Silverlight project outside the solution and build it separately? I was kind of hoping to take advtage of WCF RIA and some of the other goodies one gets from including the Silverlight app within the main solution... anybody got a fix?
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Apr 16, 2010
Using System.Linq; namespace does not supportted in VS2005 version 2.00.
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Jan 26, 2010
I'm trying to create my first Asp.Net application from scratch. Tried to create this post in some of the other forums but I couldn't find a better place.
So, as the title says, I'm having trouble trying to model my application. I'm like an OOP newbie. I'll show my classes first and then I'll write my questions.
Model Layer
public class User
{
private int id;
public int Id { get { return id; } set { id = value; } }
private string login;
public string Login { get { return login; } set { login = value; } }
private string password;
public string Password { get { return password; } set { password = value; } }
}
Data Access Layer
public class BasicDAL
{
private SqlConnection connection;
//>>Returns a new connection to the database
public SqlConnection GetConnection()
{
//>>If connection is active close it before starting a new one
if (connection != null)
if (connecion.State != ConnectionState.Closed)
connection.Close();
connection = new SqlConnection("MyConnectionStringHere");
return connection;
}
}
public class UserDAL : BasicDAL
{
//>>Insert a new user
public void Insert(User user); { /* Insert into DB */ }
//>>Authenticate user login with its password
public void Authenticate(User user); { /* Authentication code here */ }
}
Business Logic Layer
[Code]....
So, model layer is pretty simple. Just a user representation. On the Data Access Layer I have a basic class with a GetConnection method. All DAL classes will extend this one.
My first problem lies on Business Logic Layer. With the above scenario, I've placed the same methods that I placed at the DAL. BLL methods would call DAL. As simple as that but I believe It is not the best way to do it, is it? How can I improve those classes?
Also, I have to "try..catch" blocks. That's because I can't find good places for it. I mean, if I place a try..catch on GetConnection method, for instance, how my ASPX page would get this error? How my ASPX page can tell the difference between "database offline" and "sql syntax error" when executing "userBll.Insert(newUser);".
My problem is mainly placing the exception handlers. I understand I would probably have to change return type of some methods. I didn't change because I believe that will have something with the exception handlers.
Btw, please assume I can't use TableAdapters and stuff like that. I would like to create all layers by myself.
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Mar 17, 2011
I can't believe I'm having so much trouble finding this information. I'm endeavouring to learn about creating model classes with Linq to SQL. By default VS2010 wants to use SQL Express, but our organisation has several database servers for development so I'd rather use one of those. PLEASE can somebody tell me how I can configure VS2010 to do that, as all I get is 'A network-related or instance-specific error occurred while establishing a connection to SQL Server ... Verify that the instance name is correct'. Yeah, thanks Microsoft. Actually telling me how to verify the instance name would be a really good move here.
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Mar 13, 2010
Here is the scenario.
Every project has a Supervisor.
When I select the supervisor for a particular project, I'm using a dropdownlist.Table is like this
ProjectId | SupervisorId | ......
--------------------------------------
1 | 1
In my application, I'm binding a Collection of Supervisor type, which I'm feeling that it is an additional overhead. Becuase I only want his ID. So binding an object collection to the dropdown which seems no worth.
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May 21, 2010
Anyone know if I can maintain a VS 2008 (.net 3.5) project by using the VS 2010 IDE ?
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Jan 10, 2011
This problem is trivial to duplicate. Do any query on a table which contains a timestamp / rowversion column. Set a breakpoint and examine the resulting query in the Linq to SQL visualizer. Click on Execute which displays the results in a DataGridView. For each row you get "System Argument Exception: Parameter is not valid" when it tries to display the timestamp / rowversion in the grid. What is most annoying is that there is no way to get out of the visualizer without going to Task Manager and killing the Visual Studio process, devenv.exe.
This is definitely a bug. How can you presume to be able to display a database query when you can't display an essential datatype like timestamp / rowversion? Is there any way around this ? I would like to add that in general the CLR is woefully inadequate in the way it handles timestamp / rowversion fields. It would be nice if they could be defined, copied, compared, displayed and serialized in some standardized automatic way.
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Mar 3, 2011
N - Layered Application: One class library for all layers or for each layer?
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Jan 24, 2010
I am getting the above error whenever I attempt to run an application from the IDE. Any application. I have literally created a new asp.net "Hello World" app with absolutely nothing other than the aspx page, no code in the code-behind, and the only change to the web.config to enable debugging. The app errs immediately. Nothing is written to the event log.
The error is unique to asp.net, Visual Studio 2008, and has only recently started. I can run asp.net apps in VS 2005, and windows apps in 2008.The only thing I'm sure that I've done recently is installed SP1 for .net framework 3.5.
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Apr 23, 2010
We have many instances in our application where we would like to be able to access things like the currently logged in user id in our business domain and data access layer. On log we push this information to the session, so all of our front end code has access to it fairly easily of course. However, we are having huge issues getting at the data in lower layers of our application. We just can't seem to find a way to store a value in the business domain that has global scope just for the user (static classes and properties are of course shared by the application domain, which means all users in the session share just one copy of the object). We have considered passing in the session to our business classes, but then our domain is very tightly coupled to our web application. We want to keep the prospect of a winforms version of the application possible going forward.
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