I have Visual Studio 2008 installed on my machine, but I haven't used it. I did open a dummy project and make sure that version 2.0 is the .NET Framework version I am using, since it is the one that suddenly doesn't work for me.
Here's the warning message I get when I am trying to open an existing Windows 2005 project.
"Namespace or type specified in the project level Imports 'System.Data' doesn't contain any public member or cannot be found."
All of the basic System, System.Data, System.XML assemblies show up in a new project with the yellow exclamation point warning.
Does anyone know how I can solve this issue? Please help!
I would start by downloading and re-installing .NET 2.0 on your system.
You could check the project references and make sure that you have System.Data added to the project.
Related
I'm using Visual Studio Professional 2017, version 15.6.6. A co-worker gave me a solution which he says I should be able to open and rebuild without any problems. There seems to be something wrong with either the NuGet packages and/or Framework. Co-worker will only say it must be something wrong with my computer, so I'm hoping someone here can help.
I tried right clicking on the solution and picking "Restore NuGet Packages". The references still have the yellow triangle by them. I tried to rebuild anyway and got the message "The reference assembilies for framework ".NETFramework, Version=v6.0" were not found. I looked at the project properties and saw the target framework was blank. I tried choosing .NET Framework 4.6, but that gave me multiple errors of the type "Package [name of NuGet package] is not compatible with net46(.NETFramework, Version=v4.6)." The co-worker had mentioned trying .NET Core before, so I tried downloading .NET Core 3.1 from this site: https://dotnet.microsoft.com/en-us/download/visual-studio-sdks?cid=getdotnetsdk. I installed it (including restarting my computer), but don't see .NET Core in the Target framework. Can anyone help guide me getting this solution running?
Here's an image showing the missing references (yellow triangle) on the right and the reference error message when I tried to rebuild.
Here's an image after I set the framework to 4.6 and showing the target framework choices I have available:
We can see that:
.NET 6 is supported by Visual Studio 2022 and Visual Studio 2022 for Mac (and later versions).
You can update to VS2022 and try again.
I have a visual studio solution which works fine on one machine and when I copy the complete same solution to another machine it misses few external dlls.
Both the machine have same configuration and same version of visual studio.
I tried removing reference and adding again.I am able to reference the dll and use code but when I re-build,It gives the same error.Any pointers on what could have gone wrong?
The error message I get is as below
The type or namespace name 'NameSpaceName" could not be found (are you missing a using directive or an assembly reference?)
Also the warning shows.
The primary reference "NameSpaceName" could not be resolved because it was built against the ".NETFramework,Version=v4.5" framework. This is a higher version than the currently targeted framework ".NETFramework,Version=v4.0".
Both the machine have Visual Studio 2010 installed. It works on one and doesn't work on another machine
The reference you have added to the project is likely not in a subfolder of your project but referenced from the Global Assembly Cache (GAC). Since you probably didn't copy the GAC, this reference is now of a different version. Figure out which (3rd party ?) component is affected and install an older version of that component.
Typically, Visual Studio cannot target .NET 4.5, unless you applied a workaround. In that case, you can go to the project properties, Application and change Target Framework from 4.0 to 4.5.
I am developing a Visual Basic project in Visual Studio 2010 that uses ArcObjects. (I have ArcGIS 10.3 for Desktop.) I am getting the error "'RuntimeManager' is not declared. It may be inaccessible due to its protection level." A previous answer, Esri ArcObjects--Esri.ArcGIS.Version assembly, recommended adding a reference to Esri.ArcGIS.Version by clicking on Project, Add Reference, selecting it under .NET and clicking OK. I have tried to do this, but it's not under .NET. What can I do to make it available?
You should be able to find it if you use the Browse option.
The ESRI.ArcGIS.Version.dll file should be under your DeveloperKit installation folder. For me it is:
C:\Program Files (x86)\ArcGIS\DeveloperKit10.2\DotNet
I have a web application developed under Visual Studio 2005. I have a dll (home made) that I need to add as a reference to my project. I do "Add reference", the dll is added to the Bin folder but It's not added to the list of the references ! So the project doesn't compile. Could you please tell why the dll is added to the Bin folder but it's not added to the list of references of the project? Many thanks !
Walloud
If your "home created" assembly targets a framework newer than .NET 2.0, you won't be able to add a reference to it in a .NET 2.0 project in Visual Studio 2005.
Make sure your project for the DLL you created targets .NET 2.0, and not a newer framework, such as 3.5 or 4.0.
Since VS 2005 didn't know about the newer frameworks, you don't get proper error messages about this (from what I recall, though I no longer have a copy to test), which is likely why you're confused.
The problem is resolved. I was working on an XP virtual machine and it appears that there is some issue with it. When I used a real XP machine it worked !
When I change the target framework of any project in Visual Studio 2010 it does not actually change the System assembly references. For example if I target v2.0 and check the properties of System and System.Data I can see that they are still both v4.0. If i change the target to v3.5, System stays at v4.0 but System.Core changes to v3.5.
Because of this I am truly not targeting anything except v4.0.
There may be something strange in your install. I just created a WPF project, keeping the default settings, thus targeting .NET 4. Then, I switched to 3.5. VS asked to reload the project and then the targeted runtime of the references was v2 (correct) and their version was 3.5 (with an error that Microsoft.CSharp and System.Xaml were missing, which is understandable).
Then, I did the same for .NET 3 and 2 and got the same results: after reloading the project, the version of the referenced DLLs had changed were it made sense (System.Data is always v2.0).
When using the CLR v2, the vshost debug helper had its name changed to something like vshost-clrv2.
I've reinstalled Visual Studio several times and it hasn't solved anything. After uninstalling there is 10.0 stuff laying all over the place leading me to believe the uninstaller is also leaving what ever is causing this issue. I'm going to have to reinstall the OS to get the issue to go away.
I also wanted to link to my earlier post because this post has more information about how I originally discovered this issue, contains a link to the Microsoft Connect bug report I opened and links to several other users experiencing the same problem: Visual Studio 2010 Can no longer build .NET v3.5