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Disconnected architecture means that you retrieve the data and work with it without being connected to the database. Basically, this means that you aren't holding connection resources open, which makes applications much more scalable. If you are working on a web application, then you can't really work in any other way - it is impractical and undesirable to leave connections open in scenarios like this.
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Hi man,
Thanx for the reply. But i hv one more query.
If disconnected architecture is more reliable and scalable than the connected one, then why do we need the Connected Arch? why does ADO.NET provide both of them..?
The name is Sandeep
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You should use connected arch. for quickly reading data in a readonly manner (meaning each record is read one time and navigation to past records is not possible). Can be used to quickly fill controls, etc.
Using data readers def has its place and is very quick when used appropriately.
Any suggestions, ideas, or 'constructive criticism' are always welcome.
"There's no such thing as a stupid question, only stupid people." - Mr. Garrison
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thanks buddy. i think i got it somewhat clear.
kissdznuts wrote: Using data readers def has its place and is very quick when used appropriately.
can u please give a scenario in which the above said is satisfied..?
The name is Sandeep
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A form could have a couple combo boxes that users cannot change the values of and each contains 50 items. You could use datareaders to very rapidly fill the combos. You might have to fill a collection or list object of some kind, you could initially fill the data quickly with a data reader.
You wouldn't want to use a data reader and between each read perform a ton of checks and toggling UI properties, etc because you're keeping the connection alive. You want to use data readers in operations were the reads are very quick and then close the connection.
Any suggestions, ideas, or 'constructive criticism' are always welcome.
"There's no such thing as a stupid question, only stupid people." - Mr. Garrison
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Hey there all, I'm just throwing this out there to see if anyone might have an idea on something to try:
I have recently developed a new Web User Control. This is not my first User Control, I have built many. The control itself does not seem to have issues. I and others in my office can compile and use the control just fine. Yay. However, we have an off site developer to whom I have sent the source code for the control. I did not leave anything out, any required JavaScript, CSS, all required files were sent with the control. However, when he attempts to compile his site with the control, he is getting compiler errors that would seem to indicate that he is not running the correct Framework version. For example, it will not compile with automatic properties (that is, properties that rely on the compiler to build their implementation and add the associated fields to the class), and also rejects methods that are specific to Framework 3.5 such as the Generically typed "ToArray()" method of the Generic List class that is provided as an extension through the System.Linq namespace in .Net 3.5.
I asked the developer to check his target Framework for the site. It is 3.5
I asked him to check which version of System.Core his site was referencing. It is, indeed, referencing version 3.5.0.0.
I made doubly sure that the code behind file for the control contains a using statement for the System.Linq namespace, it does.
The developer apparently did not have SP1 for VS2008 or .Net 3.5 installed but he has since installed the Service Pack.
Has anyone else run into an issue like this or have an idea for something else to try. At this point I am prepared to redevelop the control as a Web Server Control so that I can send it to him pre-compiled, but we are being pushed for a deadline so if there is some quick fix out there I'd love to try that first.
Thanks for any and all suggestions.
"We are men of action; lies do not become us."
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Hi all,
How can I call MFC-dialog from managed code?
I tried to do this using platform invoke service but application core dumps because of assertions deep in MFC (because in this case I have no MFC's CWinApp running and so on).
Please advice.
Thanks
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Which technology in .Net is equivalent to EJB?
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What the heck is EJB?
Any suggestions, ideas, or 'constructive criticism' are always welcome.
"There's no such thing as a stupid question, only stupid people." - Mr. Garrison
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kissdznuts wrote: What the heck is EJB?
Enterprise JavaBeans.
"The clue train passed his station without stopping." - John Simmons / outlaw programmer
"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon
"Not only do you continue to babble nonsense, you can't even correctly remember the nonsense you babbled just minutes ago." - Rob Graham
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EJB is Java, .NET is Microsoft. Please elaborate more clearly what you are trying to find out. What exactly do you mean by technology equivalence between the two?
"The clue train passed his station without stopping." - John Simmons / outlaw programmer
"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon
"Not only do you continue to babble nonsense, you can't even correctly remember the nonsense you babbled just minutes ago." - Rob Graham
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I know I'm giving a dumb impression, but I've not used Java seriously. Anyway, have to ask: Isn't EJB more like a pattern than a pure technology. I know that there are API's that help you to encapsulate the business logic but the usage of these services is kind of an architectural question. Am I totaly lost (propably  )?
The need to optimize rises from a bad design.
My articles[ ^]
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Mika Wendelius wrote: I've not used Java seriously
Me neither. At least not since college over three years ago.
Mika Wendelius wrote: Isn't EJB more like a pattern than a pure technology. I know that there are API's that help you to encapsulate the business logic but the usage of these services is kind of an architectural question. Am I totaly lost (propably Smile)?
I'll admit I am not 100% sure. Looked at it a while back, then discover .NET and stuck with it.
"The clue train passed his station without stopping." - John Simmons / outlaw programmer
"Real programmers just throw a bunch of 1s and 0s at the computer to see what sticks" - Pete O'Hanlon
"Not only do you continue to babble nonsense, you can't even correctly remember the nonsense you babbled just minutes ago." - Rob Graham
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Paul Conrad wrote: then discover .NET and stuck with it.
That makes (at least) two of us 
The need to optimize rises from a bad design.
My articles[ ^]
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It's one of those amorphous technology things. Basically, there's a specification that says what EJB must be like and then there's a Container that hosts EJB.
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Thanks! That explains a few issues I some time ago wondered, but never had the time to really investigate what's it all about. As I agreed with Paul: I found .Net and from there on life has been nothing but sunshine
The need to optimize rises from a bad design.
My articles[ ^]
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I have some ex-Java lads working who couldn't believe who productive you could be in .NET. Now they won't go back.
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I've encountered a few people who've done both Java and .NET and all prefer .NET. One said the Java world is more advanced in some ways but the .NET world is more productive with easier-to-use tools.
Kevin
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Hi,
My company is developing a .NET 3.0 application, it uses another assembly called supportlibrary.dll, but this dll is an optional component for one set of customers. Still our company's application should work fine(other features).
I'm not sure how the design of this app should be, we are getting some exception, giving the same below
Type : System.IO.FileNotFoundException, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
Message : Could not load file or assembly 'HP.ActiveSupportLibrary, Version=2.0.0.1, Culture=neutral, PublicKeyToken=01a974bc1760f423' or one of its dependencies. The system cannot find the file specified.
Source : SystemStatus
Help link :
FileName : HP.ActiveSupportLibrary, Version=2.0.0.1, Culture=neutral, PublicKeyToken=01a974bc1760f423
FusionLog :
Data : System.Collections.ListDictionaryInternal
TargetSite : Void .ctor()
Stack Trace : at HPAdvisor.Common.SystemStatus.HealthCheckSummary..ctor()
at HPAdvisor.Common.SystemStatus.HealthCheckSummary.get_Instance() in C:\HP Advisor\25Main200812112008\src\HPAdvisor\Shared\SystemStatus\HealthCheck.cs:line 176
at HPAdvisor.MyApp.OnStartServiceRoutine(Object sender, EventArgs e) in C:\HP Advisor\25Main200812112008\src\HPAdvisor\MainFrame\MyApp.xaml.cs:line 733
at System.Windows.Threading.DispatcherTimer.FireTick(Object unused)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
Additional Info:
MachineName : SSEBASTIAN
TimeStamp : 11/13/2008 5:58:08 AM
FullName : Microsoft.Practices.EnterpriseLibrary.ExceptionHandling, Version=3.1.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a
AppDomainName : HPAdvisor.exeThreadIdentity :
WindowsIdentity : ASIAPACIFIC\sebastso
Inner Exception
---------------
Type : System.IO.FileNotFoundException, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089
Message : Could not load file or assembly 'HP.ActiveSupportLibrary, Version=2.0.0.1, Culture=neutral, PublicKeyToken=01a974bc1760f423' or one of its dependencies. The system cannot find the file specified.
Source :
Help link :
FileName : HP.ActiveSupportLibrary, Version=2.0.0.1, Culture=neutral, PublicKeyToken=01a974bc1760f423
FusionLog : WRN: Assembly binding logging is turned OFF.
To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.
Note: There is some performance penalty associated with assembly bind failure logging.
To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].
Data : System.Collections.ListDictionaryInternal
TargetSite :
Stack Trace : The stack trace is unavailable.
;200;Error;SSEBASTIAN;HPAdvisor.exe;672;C:\HP Advisor\25Main200812112008\bin\debug\HPAdvisor.exe;
11/13/2008 11:28:08.874;FATAL;(4);[7592];Unhandled Exception: System.IO.FileNotFoundException: Could not load file or assembly 'HP.ActiveSupportLibrary, Version=2.0.0.1, Culture=neutral, PublicKeyToken=01a974bc1760f423' or one of its dependencies. The system cannot find the file specified.
File name: 'HP.ActiveSupportLibrary, Version=2.0.0.1, Culture=neutral, PublicKeyToken=01a974bc1760f423' ---> System.IO.FileNotFoundException: Could not load file or assembly 'HP.ActiveSupportLibrary, Version=2.0.0.1, Culture=neutral, PublicKeyToken=01a974bc1760f423' or one of its dependencies. The system cannot find the file specified.
File name: 'HP.ActiveSupportLibrary, Version=2.0.0.1, Culture=neutral, PublicKeyToken=01a974bc1760f423'
WRN: Assembly binding logging is turned OFF.
To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1.
Note: There is some performance penalty associated with assembly bind failure logging.
To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog].
at HPAdvisor.Common.SystemStatus.HealthCheckSummary..ctor()
at HPAdvisor.Common.SystemStatus.HealthCheckSummary.get_Instance() in C:\HP Advisor\25Main200812112008\src\HPAdvisor\Shared\SystemStatus\HealthCheck.cs:line 176
at HPAdvisor.MyApp.OnStartServiceRoutine(Object sender, EventArgs e) in C:\HP Advisor\25Main200812112008\src\HPAdvisor\MainFrame\MyApp.xaml.cs:line 733
at System.Windows.Threading.DispatcherTimer.FireTick(Object unused)
at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Boolean isSingleParameter)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Boolean isSingleParameter, Delegate catchHandler)
I tried using
private bool ASLAvailable()
{
try
{
Assembly asm = Assembly.Load("HP.ActiveSupportLibrary");
if (asm != null)
{
return true;
}
else
{
return false;
}
}
catch (Exception ex)
{
//Log.Error(ex);
Log.Info("ASL Not available, returning false");
return false;
}
}
, but still getting error, as assembly binding happens much before
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Have you checked that the assembly is listed in the environment PATH statement? I don't know that this is necessary anymore, but it used to be a common problem. Alternatively, since this is reported as a File Not FOund error, perhaps you can try reinstalling the library to correct any registry ommisions.
"A Journey of a Thousand Rest Stops Begins with a Single Movement"
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Take a look at an IOC container such as Windsor.
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I've spent the past week chasing hints on MSDN toward some answer that I can use, and think I've finally found something that might work. Since this is my first app written in C# using Visual Studio I'm hopelessly lost already, and hope that you experts will be gentle...
The app's purpose is to manage information about installed and inventory components of an electrical substation. There are three components for now. Any of these can be moved to/from inventory and substations; they can be moved among circuits within a single substation; they have operation counters that must be recorded regularly; and they all require periodic testing and service.
What I've done so far is to gather all the existing paper information into an Access database. I know, it sucks, but there aren't many items and it's what we all have at work on our PCs. The last thing I want to do is use Access to develop an app to manage this stuff, so I thought it would be an ideal project to motivate me to finally dive into .Net and C# and learn it.
I've built an app UI with an opening Form containing buttons to open up a chain of events - Record Readings, Record Service, Move Equipment, and Inventory. My thought was to load subsidiary forms on each button click, then walk the user through the steps for each action using a series of new forms for each step and culminating in a database update query. I thought it would be simple; silly me...
So far what I've gleaned from MSDN is that I need to instantiate the starting form for each series in the On_Click method for its parent button, then use Show/Hide to render subsequent forms active and visible. Along the way, each form will have to instantiate the next in the series, and each form will have to include code to Close the previous form. Am I on the right track here? Or am I as totally confused as I feel?
All of the documentation on MSDN assumes a single Form for an app, except for MDI applications, which I do not want to use, so there aren't a lot of clues there. I'd rather not use dialog boxes because the intended users are very simple and need a consistent appearance on every page. I've derived all the forms from the opening form so that they all look identical except for the arrangement of controls in the body of the form, and I'd like to maintain that consistency.
Thanks for your guidance, and if you could recommend a really good book for learning this sort of thing, I'd really appreciate it.
"A Journey of a Thousand Rest Stops Begins with a Single Movement"
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Roger Wright wrote: Thanks for your guidance, and if you could recommend a really good book for learning this sort of thing, I'd really appreciate it.
Probably not. A wide range of knowledge is brought into scope with a real project such as this. While there are sample applications that use databases, they only depict one approach (the one used in the sample ). That approach, while workable is not necessarily optimal or advisable for a production product.
For example:
Roger Wright wrote: My thought was to load subsidiary forms on each button click
Rather than have multiple forms you can use a window to display different views of the data. This is generally more user friendly.
As I stated that is only one example, moving on.
Roger Wright wrote: into an Access database. I know, it sucks, but there aren't many items and it's what we all have at work on our PCs.
I strongly advise you NOT to use Access. Take a look at SQL Server Express. There is a 2008[^] and 2005 version.
Roger Wright wrote: if you could recommend a really good book for learning this sort of thing, I'd really appreciate it.
As I stated earlier "this sort of thing" is a large scope of topics so probably not. Some of the topics might be covered in the SQL Server 2005 Sample Applications[^]
led mike
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Thanks for the info! 
Actually, the database part is likely to be the easy part. For me the stumbling block has always been the GUI, and getting the navigation to work, variables passed back and forth, and so on. My experience trying to program for Windows has been uniformly abysmal - the documentation sucks, the example code is specious or incorrect, and the models don't resemble the real world apps I need to build. So I've always had to resort to doing a console app to get the job done. I'd like to be done with that, and that's the sort of book I'm trying to find.
I'll look into SQL Server Express, but I've already built the database using the only tools we have at work, including stuffing years of data into it. Maybe I can find a migration tool to handle that for me. I know some earlier versions of Access came with an Upgrade tool to migrate .mdbs to SQL Server; there's certain to be one like it still.
Thanks, again!
"A Journey of a Thousand Rest Stops Begins with a Single Movement"
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Roger Wright wrote: So far what I've gleaned from MSDN is that I need to instantiate the starting form for each series in the On_Click method for its parent button, then use Show/Hide to render subsequent forms active and visible. Along the way, each form will have to instantiate the next in the series, and each form will have to include code to Close the previous form. Am I on the right track here? Or am I as totally confused as I feel?
As the previous poster mentioned, I would try to get everything in one window and just display the new controls for each step. To do this, you could create a container form then create several UserControls corresponding to the steps in the process. On the container form, you could include Next/Previous type buttons that when clicked, determine where the user is and which UserControl to bring up next. Most likely, you will have a panel of some sort that will hold the current UserControl.
You could create all the UserControls and startup and simply change the Visible property to show and hide the current control, but this would significantly increase load time. You will be better off to create each UserControl when you need it and destroy it when moving to the next one.
If you can use WPF (.NET 3.0), that could simplify the process. WPF has specific infrastructure to create wizard-like applications similar to what you are describing (look for Pages instead of Window).
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