The project builds just fine locally, however when we attempt to have our build server build it the following error is generated.
error CS0234: The type or
namespace name 'Outlook' does not exist in the namespace 'Microsoft.Office.Inte
rop' (are you missing an assembly reference?)
The reference is correctly set in the project and the using statement is also set, the Outlook PIA has been installed on the build server.
The using statement: using Outlook_IntOp = Microsoft.Office.Interop.Outlook;
We also are already using the Excel Interop and its been building fine, every reference to outlook is just like the excel references.
Everything I have found so far point to adding the reference to the project, it is there and builds fine locally. This error only occurs on the build server which does not have Office or visual studio loaded.
Anyone have any ideas what might be happening here and how to get around it. Installing Office and Visual Studio really isn't an option afforded to me.
Make sure your project has the reference to an existing interop dll, not to the actual COM server object ("Microsoft Outlook" on the COM tab in VS Project References dialog). In the latter case the interop gets regenerated and you will have problems if Outlook is not installed on your builder machine.
This question already has answers here:
Visual Studio 2012 - Can't find System.Transactions assembly in .NET 4.5 framework
(2 answers)
Closed 6 years ago.
This is in an ASP.Net web application, with Visual Studio 2013. The solution is composed of several projects. I have code in a library project that has using System.Transactions, and it's worked well for months.
Today I added the same using System.Transactions in code in the web application project, and it fails with the error message below:
The type or namespace name 'Transactions' does not exist in the namespace 'System'
Here are a few things I've tried:
Added a reference to System.Transactions.
Verified that the referenced dll file is the same in both projects.
Changed the framework from 4 to 4.5 and back.
Verified that all projects are using the same framework version.
Cleaned and rebuilt the solution.
Quit Visual Studio, deleted all files in AppData>Local>Temp, rebuilt.
Restarted the PC.
So, the upshot is that using System.Transactions works fine in one project but not another, even though both projects are in the same solution.
Any suggestions?
EDIT: Here's an oddity that's probably not any additional help, but here goes:
When I build the project, there are no errors. That is, the using System.Transactions compiles just fine.
If I run application, it bombs and the error appears in browser window. The VS code window still shows no errors.
If I edit the using System.Transactions or add code like var x = System..., the errors immediately appear in the using System.Transactions.
** EDIT:** This question was marked as duplicate. It isn't -- the proposed duplicate solved the question by browsing to the reference. I had already tried that and it didn't help. In my case, I had to use the "copy local" option.
Refer to this Answer By Mark Hall
There is a Microsoft Connect entry posted for this. There is a comment that suggests that you can browse for it. The path given is:
C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework.NETFramework\v4.5\System.Transactions.dll
Just Add reference by browsing to this path
if this did not work, Go to References -> System.Transactions and make sure on the properties for this reference that "Copy Local" is set to True.
usually System.Transactions is not part of your references, try to add it in your references by:
right click on your references if you are using Web Application or in your Project if you are using Web Site.
find the System.Transactions in the .NET references.
You should find the System.Transactions in your references.
I'm working on a C# 4.0 project in VS2010 and needed to use some older DLLs containing controls that were created in C# 3.5 on VS2008. When I first add the DLLs to the references, I was able to see the namespace via intellisense and create an instance of one of the controls, but when I go to build, it gives me the following error:
The type or namespace name 'BCA' could not be found (are you missing a using directive or an assembly reference?)
And I do have a using directive for that namespace already, which is now underlined in red, showing that VS cannot find it. And now, intellisense won't pick up that namespace at all.
I even tried added the controls to the toolbox (which worked) but then when I drag them to the GUI, it says that it cannot locate the DLL reference, even though it obviously knows where it is.
I even tried changing the target framework to 3.5, but still with the same results.
Any thoughts as to why this could be happening?
Edit - I've notice that in the csc.exe arguments that VS outputs, it does not have any /reference entries for the DLLs I'm trying to use. When I create the same basic project in VS2008, those entries exist. Also, I can successfully reference the DLLs in a DLL project in VS2010... it seems to just be WinForms projects that don't work.
Turns out that it was something to do with VS2010 defaulting to the .NET 4 client profile, as soon as I changed it to the regular profile it built fine. There's a day wasted...
view the target framework.. in my project, was 4.0 client profile, e the reference dll was in 4.0
I tried Build->Clean Solution and then could add the reference.
I used to have similar problem, but the profiles were not the issue, so the problem was that my class library use a special NuGet package that has Dependency... so I install the dependency package in the target project and added the project reference and works!
But I am not sure if there is a better solution for this problem??? for me VS should be smart enough to carry those dlls along with the references. (I already verified that "Copy Local" is set to True)
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I have a WCF Data Service project built with Visual Studio 2010, which was working fine. All of a sudden, it didn't compile anymore. It was giving me messages like:
Error 7 The type or namespace name 'Services' does not exist in the namespace 'System.Data' (are you missing an assembly reference?) C:\U...s\Visual Studio 2010\Projects...\DataService.cs ...
Error 8 The type or namespace name 'Linq' does not exist in the namespace 'System' (are you missing an assembly reference?) DependencyResolver.cs 3 14
Error 10 The type or namespace name 'Web' does not exist in the namespace 'System.ServiceModel' (are you missing an assembly reference?)
Error 12 The type or namespace name 'DataService' could not be found (are you missing a using directive or an assembly reference?)
How can I fix it?
I have had the same problem, and I had to set the "Target Framework" of all the projects to be the same. Then it built fine. On the Project menu, click ProjectName Properties. Click the compile tab. Click Advanced Compile Options. In the Target Framework, choose your desired framework.
I had an issue with System.Linq not being recognized. The using statement had a red squiggly, etc. The way I solved it was to change my website to target dotnet 3.5, then switch back to the original targeted framework (4.0 in my case).
I found that this is caused by me having the same namespace name as class name (MyWorld.MyWorld = Namespace.ClassName).
Change your namespace to a name that is not the same name as your class and this will compile.
Source
I faced the same issue with an ASP.NET MVC site when I tried to use LINQ to SQL. I fixed the problem by:
Solution Explorer -> References -> Right-click on System.Data.Linq -> Copy Local (True)
I have experienced same problem with System.Data.SQLite. The source of the problem is the dll you have used should have same .NET version with your project.
For example if you have used (in my case) SQLite for .NET 4.5, your platform target should be .NET 4.5 too.
You can find platform target by: Project > (project name) Properties > Build.
Check to see that your target framework has the same .NET versions. I had the same problem and my class .NET was 3.5 and web solution had 4.5. I synchronised those, and then it worked :)
I had the same problem and tried all of the above without any success, then I found out what it was:
I'd created a folder called "System" in one of my projects and then created a class in it. The problem seems to stem from having a namespace called "System" when the .cs file is created, even if it is in a namespace of "MyProject.System".
Looking back I can understand why this would cause problems. It really stumped me at first as the error messages don't initially seem to relate to the problem.
In my case the problem was happening because the class I created had a namespace that interfered with existing classes. The new class A had namespace zz.yy.xx (by mistake). References to objects in another namespace yy.xx were not compiling in class A or other classes whose namespace was zz.
I changed the namespace of class A to yy.xx , which it should have been, and it started working.
FOR ANYONE WITH LINKED FILES: I had this problem and was using silverlight and the offending file that was throwing this error was a linked file.
The error from the compiler told me the error was happening in the project that the file lived in. It ended up that the error was NOT in that project, it was occurring in the project that contained the linked file. That project was missing a reference.
I encountered this problem while using Visual Studio's Git integration to manage the project. For some reason the Windows Phone 8 project would compile just fine when targeting x86, but when I set it to target ARM, it would fail compiling with an error indicating that "Advertising" didn't exist in the Microsoft namespace.
I ended up resolving the issue by removing the Microsoft.Advertising.*.dll reference and adding it again.
I experienced the same errors. After I discovered my project had the wrong Assembly name (I copied files from a different project and the namespaces got a little confused), and changed it back, the project compiled nicely.
I got a very similar error message that was caused by inadvertently having made a duplicate of a class in another project of my solution. Deleting the duplicate fixed the issue
And if all else fails, such as ensuring that the target frameworks are the same, and you are dealing with a WPF class library in VS2010, simply restart Visual Studio. That did it for me.
In my case there was no change in projects, it just stopped to compile and with "type or namespace name XXX does not exist" and in the complaining class itself intellisense for that XXX namespace/class works fine.
The problem was in references indeed!
Steps to reproduce:
Solution has ProjectA, ProjectB.
ProjectA references to third party log4net and it is marked Copy local: true.
ProjectB references ProjectA and does not have reference to log4net.
Solution compiles fine.
Change in ProjectA: reference property for log4net to Copy local: false.
Clean bin and obj folders.
When you compile, ProjectA compiles but ProjectB complains about not finding ProjectA namespace.
This is because ProjectB bin folder is missing third party library (log4net in my case)!
In this case solution would be -
make sure that third party libraries references are set to Copy local: true
or
add path to such libraries in project properties under reference path.
I am referencing Microsoft.CommerceServer.Runtime.Orders and experienced this error. This project is old and has Target framework .NET 2.0. In output I had this error:
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Microsoft.Common.targets(1605,5): warning MSB3268: The primary reference "Microsoft.CommerceServer.Runtime" could not be resolved because it has an indirect dependency on the framework assembly "System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" which could not be resolved in the currently targeted framework. ".NETFramework,Version=v2.0". To resolve this problem, either remove the reference "Microsoft.CommerceServer.Runtime" or retarget your application to a framework version which contains "System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"
I simply changed the target framework to .NET 4 and now it builds.
I recently needed to do a System Restore and it caused several of my files to change/disappear that I had been working on since the restore. Some of those were DLL files. I used Source Control to retrieve the entire project but I still had a similar issue as above. I found this answer that described you may need to remove a DLL and readd it to get your errors fixed. This was the case in my scenario.
Removing WebMatrix.WebData and readding it as well as adding in WebMatrix.Data fixed my error of The type or namespace name 'Data' does not exist in the namespace 'WebMatrix' ....
Delete the .refresh.dll file if you are under source control. Then rebuild. It should work.
This worked for me
I'm working on a C# 4.0 project in VS2010 and needed to use some older DLLs containing controls that were created in C# 3.5 on VS2008. When I first add the DLLs to the references, I was able to see the namespace via intellisense and create an instance of one of the controls, but when I go to build, it gives me the following error:
The type or namespace name 'BCA' could not be found (are you missing a using directive or an assembly reference?)
And I do have a using directive for that namespace already, which is now underlined in red, showing that VS cannot find it. And now, intellisense won't pick up that namespace at all.
I even tried added the controls to the toolbox (which worked) but then when I drag them to the GUI, it says that it cannot locate the DLL reference, even though it obviously knows where it is.
I even tried changing the target framework to 3.5, but still with the same results.
Any thoughts as to why this could be happening?
Edit - I've notice that in the csc.exe arguments that VS outputs, it does not have any /reference entries for the DLLs I'm trying to use. When I create the same basic project in VS2008, those entries exist. Also, I can successfully reference the DLLs in a DLL project in VS2010... it seems to just be WinForms projects that don't work.
Turns out that it was something to do with VS2010 defaulting to the .NET 4 client profile, as soon as I changed it to the regular profile it built fine. There's a day wasted...
view the target framework.. in my project, was 4.0 client profile, e the reference dll was in 4.0
I tried Build->Clean Solution and then could add the reference.
I used to have similar problem, but the profiles were not the issue, so the problem was that my class library use a special NuGet package that has Dependency... so I install the dependency package in the target project and added the project reference and works!
But I am not sure if there is a better solution for this problem??? for me VS should be smart enough to carry those dlls along with the references. (I already verified that "Copy Local" is set to True)