I am trying to work with GeoCoordinate which is meant to be supported by .Net Framework 4.5. I am working on winodws 8 and I have .Net Framework 4.5, but I keep getting The type or namespace name 'Device' does not exist in the namespace 'System' error.
Any solution?
The type or namespace name 'XXX' could not be found...
Always bear in mind, if you get this error there are three possibilities.
You missed the using directive.
You missed the Assembly reference
You have "using directive" as well as "Assembly reference" in place but the current project's target framework version is lower than the referenced assembly target framework version.
Almost all the cases above three steps should solve the problem.
Hope this helps.
Does not have added reference of System.Device dll in your project.
Steps to Add Reference.
1. Right click on the Reference folder on your project.
2. Select Add Reference.
3. Expand Assemblies option.
4. Search System.Device in the serach box at right corner side.
5. After searching, click on checkbox to select and click on ok.
If you are using VS.NET:
Right click on the References folder on your project.
Select Add Reference.
Select the .NET tab (or select the Browse button if it is not a .NET Framework assembly).
Double-click the assembly containing the namespace in the error message.
Press the OK button.
If you are using the command line, use the /r: or /reference: option. For Example:
csc.exe /reference:System.Drawing.dll MyFontDisplayApp.cs
When you recompile, this error will no longer appear.
It is also possible that your project uses x64 libraries and your machine has limited x64 libraries. I think this happened in my case.
Possible Solution: I copied library from x86 folder to bin folder of my project. Then added the new reference(discard the old reference to same library). AND IT WORKED.
Note: Please correct me if I am wrong here.
I have added the reference TlGallioAddOn.dll to our sample c# application. I have using that reference like using TlGallioAddOn;. When using that reference of that dll it shows the following error.
The type or namespace name 'TlGallioAddOn' could not be found (are you missing a using directive or an assembly reference?)
Could u all please help me to resolve that.
Right click the project in your Solution Explorer. Click 'Add Reference' then find your DLL. It will import the DLL and resolve the error.
Check the framework target of both projects.
Project defaults are now .NET 4.0 Client. If you've compiled the addon project against .NET 4.0 (Full), you'll need to modify the project for which you're adding a reference to use .NET 4.0 (Full) also.
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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 can't compile a project because the namespaces System.Web.UI and System.Web.Security are missing. I can only see System.Web.ApplicationServices, System.Web.Mvc and System.Web.Services when I do add references. Where do I download the missing namespaces?
Go to menu Project -> Add reference and find out the System.Web.dll in the list
I don't know about System.Web.UI, but System.Web.Security moved to the System.Web.ApplicationServices assembly in .NET 4.0 Framework.
Following Kinderchocolate's suggestion, I switched to ".Net Framework 4" in my project's Properties (VS 2010), and that caused "System.Web" to appear in the assemblies list. From then on I was finally able to use System.Web.UI.
So I'm not sure what failed for kinderchocolate, but his change worked for me.
You can add System.Web.ApplicationServices assembly in .NET 4.5 Framework.
using System.Web.ApplicationServices;
Yes, Kinderchocolate is correct. Once you add the Reference System.Web to your project, then in the code you can add using System.Web.UI and all sub-components of System.Web.UI, e.g. System.Web.UI.HtmlControls.
you can go to : project -> proprieties -> and change the Framework from Client profile to .Net 4, if it doesn't work you can add the reference manually. Good luck
Add references System.Web.Extensions and System.Web.Extensions.Design in 4.6.1
if you miss ListView or LinqDataSource
I am trying to make a Cassini-like server for a particular asp.net web application. The Client is not happy with the Cassini interface, so I am just expanding the Cassini code, adding new features, and providing a fresh look to the UI.
Now the problem I am facing is, all the files from Cassini source use the System.Web.Hosting namespace. Visual Studio throws me an error saying:
The type or namespace name 'Hosting' does not exist in the namespace 'System.Web' (are you missing an assembly reference?)
What am I missing here? I have already written
using System.Web.Hosting;
in the first line of the .cs file. I am using .Net FW 3.5 and VS2008.
Any help would be seriously appreciated.
Thanks.
Most likely, your project is targeting the "Client Profile" version of the .NET Framework, which doesn't include the System.Web.Hosting namespace.
You need to change your project to target the full version of the framework, and then add a reference to System.Web. To do this, follow these steps:
Open your project Properties by double-clicking on "Properties" in the Solution Explorer.
From the drop-down box labeled "Target framework," choose ".NET Framework 3.5". Visual Studio will inform you that this requires closing and re-opening your project, so make sure that it is saved first before clicking "Yes".
When your project re-opens, right click on "References" in the Solution Explorer, and select "Add Reference" from the context menu.
Find the item named "System.Web" under the ".NET" tab in the resulting dialog box, and click OK.
You have to add the System.Web reference to the project.