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Tricky to answer that one. In principle, C# is just a compiler, which compiles code to the CIL (or MSIL). Now MSIL has not changed greatly since standardisation (I don't even think it has changed), so things look bright there. The problems are that:
C# is not a pure compiler. For some language features (for example it's basic object implementation), it relies on the CLR to supply the implementation. So constructs which are added to the language may well rely on specific features of the libraries.
Also when compiling code (which happens in asp.net pages), the compilation will rely on System.CodeDom.Compiler to emit the MSIL. Since System.CodeDom.compiler is part of the CLR, you could say that there is a dependency on the libraries ( I'm pretty sure that when you compile through the C# compiler, the compiler relies on the CLR to emit it's bytecode, and will choose the adequate version of the CLR for it's task.
SO: I'm not sure, this is educated guesswork. Haven't found anything on this subject really.
Anybody can offer some more insight?
Pity that Brad Abrams has just left Microsoft, he would have been the person to ask... He's the father of .Net. http://blogs.msdn.com/brada/default.aspx[^]
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Technically, there are no different versions of C#; there are only different versions of the framework, which instruct the IDE, compiler, linker and other tools as to what is correct and what is not. If you use the 4.0 framework, then you are automatically using C# 4.0; if you use the 1.1 framework, then you are using C# 1.1.
Because of this, there is no minimum version of the framework, there is only the version needed by your application. If you compile your app to the 4.0 framework, your user will need to have the 4.0 framework. This is because the code does not reference System.Core, it references System.Core version 4.0.0.0 public key token whatever. If that assembly is not found, your user will not be able to run the app. Likewise, you cannot compile your app to the 2.0 framework and expect it to work if the user has only 3.5 or 4.0.
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Gregory.Gadow wrote: Likewise, you cannot compile your app to the 2.0 framework and expect it to work if the user has only 3.5 or 4.0.
Not entirely true. .Net framework 3.5 and 4.0 are technically extensions of the 2.0 Framework, though dependant on enhancements made in service pack 1 of 2.0. Therefore anyone with 3.5 or 4.0 installed DOES have 2.0 installed, so 2.0 apps will continue to work fine. However you you will have to build against service pack 1 which only comes as part of the 3.5 and 4.0 bundles. It is not available separately, so you may as well build against the later frameworks even if you do not use their functionality.
3.5 to 4.0 is I believe a breaking change, and likewise 1.0 to 1.1 to 2.0. As far as I am aware only the 2.0 Framework has persisted upstream.
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3.0 and 3.5 were additive releases to the 2.0 framework that also included some service packs to 2.0.
However, The 4.0 framework is a completely different version than the 2.0 framework. Just having the 4.0 framework does not imply that the 2.0 framework is present.
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Thanks for the clarification 
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My god - could this BE any more complicated. I thought .NET was supposed to cure the old 'DLL hell'; seems to have replaced one set of problems with another.
Does anyone know if you can get an installer (or something) that will simplify the process of getting the right version of .NET for an application?
Over the years, I have always found myself having a negative reaction to many Java applications because they just never seemed to work (though this does seem to have improved somewhat recently). The reason could have been bad coding, but I got the feeling a lot of it may have been due to having the wrong framework installed. If I were trying out a .NET application and I got a runtime exception saying the right version of the framework was missing, I'd be that much more likely to ditch the app - especially if it were just something small that I was evaluating.
I guess the point I am really making here is that all this version stuff needs to be something the end-user just doesn't have to worry about or .NET and I as the developer are failing them in a big way and they will simply go back to that old C++ .exe they know and trust.
-Patrick
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Actually, scratch the question in my last post. Following the link posted by Jinal, it looks like I need to investigate 'Click Once' deployment maybe.
-Patrick
PS - My first ever program was a plot of X-squared on a ZX81 in BASIC (which crashed because of lack of screen memory after plotting the fourth block); stuff is just too big and complicated for me these days. Maybe I need a new job - pushing trolleys at ASDA maybe.
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This information is more difficult to find than it should be. Here is a breakdown which shows how Visual Studio, CLR, and .NET Framework versions relate to each other:
Visual Studio CLR .NET Framework
----------------------------------------------------------------------------------------
Visual Studio .NET (Ranier) 1.0.3705 1.0
Visual Studio 2003 (Everett) 1.1.4322 1.1
Visual Studio 2005 (Whidbey) 2.0.50727 2.0
Visual Studio 2005 with .NET 3.0 Extensions 2.0.50727 2.0, 3.0
Visual Studio 2008 (Orcas) 2.0.50727 2.0 SP1, 3.0 SP1, 3.5
Visual Studio 2008 SP1 2.0.50727 2.0 SP2, 3.0 SP2, 3.5 SP1
Visual Studio 2010 (Hawaii) 4.0.30319 4.0
As for how C# relates to all of this, the breakdown is:
C# CLR .NET Framework
--------------------------------------------------------------------------------------
1.0 1.0.3705 1.0
1.1 1.1.4322 1.1
2.0 2.050727 2.0, 2.0 SP1, 3.0, 3.0 SP1
3.0 2.050727 2.0 SP2, 3.0 SP2, 3.5, S.5 SP1
4.0 4.0.30319 4.0
<update>Corrected the information for C# 3.0.
Scott Dorman Microsoft® MVP - Visual C# | MCPD
President - Tampa Bay IASA
[ Blog][ Articles][ Forum Guidelines]
Hey, hey, hey. Don't be mean. We don't have to be mean because, remember, no matter where you go, there you are. - Buckaroo Banzai
modified on Sunday, April 25, 2010 9:02 AM
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Thanks for all these replies. I expected a nice one-line answer, but clearly it is all a lot more complicated than that. I am going to print out this table. I know Visual Studio largely worries about everything for you, but as a veteran C++ programmer, I do like to know what versions of code are running (or failing to run) with each other.
Thanks for all the help.
Best wishes, Patrick
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In addition to what other people said..
You can use C# 3 with .NET 2.0 with some restrictions. For example, to make extension methods work you need to add the following code:
namespace System.Runtime.CompilerServices
{
[AttributeUsage(AttributeTargets.Method | AttributeTargets.Class | AttributeTargets.Assembly)]
public sealed class ExtensionAttribute : Attribute
{
public ExtensionAttribute() { }
}
}
The attribute does nothing, it's used internally by the compiler to mark extension methods.
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I have just moved to doing real dev in VS2010, when I first started using it the interface was very slow.
I unchecked the option to automatically adjust for best visual experience which ironically helped it to perform better.
The problem that I have now is that I have also started using Expressions Studio and it is dog slow on my machine my boss who is running a similar machine is not seeing it.
He however is using a desktop which has a better video card than mine while that is logical my card is not really that bad so I wonder is there a way I can optimize the settings of my card for WPF performance or does someone know if there is a similar option to disable to enhanced user experience in Expressions.
Here a my machine specs and advice is appreciated.
Dell Vostro 1700 laptop
Core 2 duo 2.2ghz
4 Gig Ram
slow hard drive 5400rpm
One thing that might be important my res is 1920x1200 on my machine and 1280x1024 on my secondary monitor.
NVidia Geforce 8400M GS gpu I have the most current drive only update after seeing the problem.
Windows XP Pro SP3 32bit
I do not see this slowness in other applications that are not WPF.
Humble Programmer
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Just a thought, check if you have the latest and greatest DirectX.
Updating your videocard driver might also help, although I doubt that NVidia still produce a lot of updates for XP. (update, you've done that, sorry).
Oh I and about your check box: best visual experience means slower in most cases, because then you get all the gizmo's like shadows, transparency, textures, etc, which can really slow things down. Turning them off makes it look ugly, but fast.
WPF uses GDI+ to it's painting, and that kicks down to DirectX, which hopefully is able to offload most of it's processing to the card. That's where the drivers come in. Unfortunately the 8400M GS is quite an underpowered card for today's standards (I see it rated at around 39 Gigaflops). These cards offer a good video watching performance (but I doubt that what's your boss expects of you), but are poor at gaming. Unfortunately, WPF draws upon the gaming features.
So, pretty please to your boss (or just steal his videocard while he's out of the office, chances are he won't notice the difference - I used to swap whole motherboards as a young(er) programmer  I started coding in 1976, and swapping the mainframe's motherboard was not an option )
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LOL entertaining post...
I know that the card is under powered although he is a game so he would notice real quick.
I am going to check on the DX thing though I was just hoping I could turn off some features in expressions because like I said when I toned it down in VS it made a big difference.
Humble Programmer
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Hello,
First, a quick summary of our situation:
We are using Visual Studio 2008, with VSTO installed, and OpenXML 2.0 ;
We developped an Add-In for Office 2007 that needs to use Isolated Storage:
normal saving process does not use isolated storage, but when trying to save large xml content, it actually occurs and we get an IsolatedStorageException "unable to determine caller domain".
Now the detailed facts:
* We have developped an Add-In for Office 2007, using VSTO and OPENXML 2.0.
* During a long XMLDocument.Save operation, we get an Exception.
* Looking at the exception stack, we found out that for big operations like the one we wanted to do, IsolatedStorage was invloved: just before IsolatedStorage operations start there is a MS.Internal.IO.Packaging.SparseMemoryStream.SwitchModeIfNecessary() call.
I copied the Exception stack at the end of my post.
* The Exception says "unable to determine callers domain".
On this article: http://blogs.msdn.com/shawnfa/archive/2006/01/18/514407.aspx
it is said that this is because our application is not ClickOnce, and has its appdomain.CurrentDomain.ActivationContext property set to null.
* VSTO is responsible for creating an application domain for each Add-In that is loaded. I guess we cannot change that. Source:
http://www.vikasgoyal.net/office/VSTO%20Application%20AddIn%20Architecture.aspx
* Before executing the Save statement that crashes the program, I tried to load my assembly in another application domain using AppDomainSetup creating an AppDomain app and then caliing app.CreateInstanceAndUnwrap(...).
When I tried, I got the following exception : "Could not load type 'IsolatedStorage.IsolatedStorageHelper' from assembly 'SUMO 2007, Version=2.1.3758.26177, Culture=neutral, PublicKeyToken=4408dabe99529f64'."
I guess VSTO does not allow our assembly to be launched on another application domain, but I'm not sure of this.
At this point, I'm pretty stuck, so any kind of help or suggestion is welcome. I 'd be glad to give you more details on our project if that could help fixing this issue.
Thanks in advance,
Aurélien
Exception Stack:
at System.IO.IsolatedStorage.IsolatedStorage._InitStore(IsolatedStorageScope scope, Evidence domainEv, Type domainEvidenceType, Evidence assemEv, Type assemblyEvidenceType, Evidence appEv, Type appEvidenceType)
at System.IO.IsolatedStorage.IsolatedStorage.InitStore(IsolatedStorageScope scope, Type domainEvidenceType, Type assemblyEvidenceType)
at System.IO.IsolatedStorage.IsolatedStorageFile.GetStore(IsolatedStorageScope scope, Type domainEvidenceType, Type assemblyEvidenceType)
at MS.Internal.IO.Packaging.PackagingUtilities.GetDefaultIsolatedStorageFile()
at MS.Internal.IO.Packaging.PackagingUtilities.CreateUserScopedIsolatedStorageFileStreamWithRandomName(Int32 retryCount, String& fileName)
at MS.Internal.IO.Packaging.SparseMemoryStream.SwitchModeIfNecessary()
at MS.Internal.IO.Packaging.SparseMemoryStream.Write(Byte[] buffer, Int32 offset, Int32 count)
at MS.Internal.IO.Packaging.CompressEmulationStream.Write(Byte[] buffer, Int32 offset, Int32 count)
at MS.Internal.IO.Packaging.CompressStream.Write(Byte[] buffer, Int32 offset, Int32 count)
at MS.Internal.IO.Zip.ProgressiveCrcCalculatingStream.Write(Byte[] buffer, Int32 offset, Int32 count)
at MS.Internal.IO.Zip.ZipIOModeEnforcingStream.Write(Byte[] buffer, Int32 offset, Int32 count)
at System.Xml.XmlUtf8RawTextWriter.FlushBuffer()
at System.Xml.XmlUtf8RawTextWriter.RawText(Char* pSrcBegin, Char* pSrcEnd)
at System.Xml.XmlUtf8RawTextWriter.RawText(String s)
at System.Xml.XmlUtf8RawTextWriter.WriteStartElement(String prefix, String localName, String ns)
at System.Xml.XmlWellFormedWriter.WriteStartElement(String prefix, String localName, String ns)
at System.Xml.XmlElement.WriteTo(XmlWriter w)
at System.Xml.XmlElement.WriteContentTo(XmlWriter w)
at System.Xml.XmlElement.WriteTo(XmlWriter w)
at System.Xml.XmlElement.WriteContentTo(XmlWriter w)
at System.Xml.XmlElement.WriteTo(XmlWriter w)
at System.Xml.XmlElement.WriteContentTo(XmlWriter w)
at System.Xml.XmlElement.WriteTo(XmlWriter w)
at System.Xml.XmlElement.WriteContentTo(XmlWriter w)
at System.Xml.XmlElement.WriteTo(XmlWriter w)
at System.Xml.XmlElement.WriteContentTo(XmlWriter w)
at System.Xml.XmlElement.WriteTo(XmlWriter w)
at System.Xml.XmlElement.WriteContentTo(XmlWriter w)
at System.Xml.XmlElement.WriteTo(XmlWriter w)
at System.Xml.XmlElement.WriteContentTo(XmlWriter w)
at System.Xml.XmlElement.WriteTo(XmlWriter w)
at System.Xml.XmlElement.WriteContentTo(XmlWriter w)
at System.Xml.XmlElement.WriteTo(XmlWriter w)
at System.Xml.XmlElement.WriteContentTo(XmlWriter w)
at System.Xml.XmlElement.WriteTo(XmlWriter w)
at System.Xml.XmlElement.WriteContentTo(XmlWriter w)
at System.Xml.XmlElement.WriteTo(XmlWriter w)
at System.Xml.XmlElement.WriteContentTo(XmlWriter w)
at System.Xml.XmlElement.WriteTo(XmlWriter w)
at System.Xml.XmlElement.WriteContentTo(XmlWriter w)
at System.Xml.XmlElement.WriteTo(XmlWriter w)
at System.Xml.XmlDocument.Save(XmlWriter w)
at SUMO_2007.PackageManager.EAttributePackageDataManager.TablePackageDisplayAttributes(String Docpath) in F:\SSE v2.1\SUMO 2007\erms.rule\erms.Package.rule.DataManager\EAttributePackageDataManager.vb:line 857
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Hello,
I have a .mdb database with approx. 100 000 records linked to a combobox on a simple form in VS .net VB. It takes over one minute to populate a 'standard issue' combobox, I believe it's awful slow. I tried to use a third-party listbox (a trial from devexpress suite), it's lightning fast in comparison. But hey, I need a combobox Could you please tell me if there's any way of making things a bit faster? Is there a good replacement to the standard combo that can be bound to an MS Access database?
Thanks in advance for you input
-Tony-
P.S. I also tried to play with different connection options etc, tried loading xml file into the combobox - it's the same problem, too slow...
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aa2010 wrote: 100 000 records linked to a combobox
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Life is a computer program and every one is the programmer of his own life.
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Life is like a box of chocolates. Sometimes it contains nuts.
"WPF has many lovers. It's a veritable porn star!" - Josh Smith As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.
My blog | My articles | MoXAML PowerToys | Onyx
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Some people like nuts.
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The issue you are facing here is that you have too many items in the combo box. 100K items is unusable from a users point of view - how are they ever going to find anything? I suspect that you are looking to achieve the effect of a lookup combo where the data is presented based on what the user types in (a la an autocomplete combo). The reason the third party listbox is so fast is that it is using virtualisation to load only a subset of the data - more gets added on demand.
"WPF has many lovers. It's a veritable porn star!" - Josh Smith As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.
My blog | My articles | MoXAML PowerToys | Onyx
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Yep. This is a simple dictionary app, so in fact I am using it more like a lookuplistbox/lookupcombobox (dropdown style = simple) whereby a user instead of picking the desired value from the dropdown list finds whatever he types into the combo. A while ago I tried that in Delphi - worked OK, loaded in less than a sec.
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You might want to look into the AutoCompleteMode[^] property then.
"WPF has many lovers. It's a veritable porn star!" - Josh Smith As Braveheart once said, "You can take our freedom but you'll never take our Hobnobs!" - Martin Hughes.
My blog | My articles | MoXAML PowerToys | Onyx
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This may be a dumb question, so feel free to ignore this, but are you sure a combo box is what you really want here? How on earth are the users expected to use a combo box with 100,000 entries in it? Trying to find the entry you are look for in a drop-down with 100,000 entries is going to be really hard to use in the real world.
Could you possibly implement some sort of filter where the users could type in part of the data they are looking for, then use that to query the table and load up the matching results based on the search criteria entered. So, for example if it was a list of names and they typed "Smith" then it would only load names like Smith* into the list. If you search for "combo box autocomplete" or similar then you might find something that would help.
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After importing the xml file to dataset , it contains 3 tables .its linked
How I can join these tables into one table.
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