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"Storage" does not exist in the namespace "Microsoft.Xna.Framework"

I don't understand why it appears given error : The type or namespace name "Storage" does not exist in the namespace "Microsoft.Xna.Framework" (assembly reference may be missing).
I try to download Microsoft XNA Framework Redistributable 4.0.
How to fix it?

You haven't given any information to your problem such as code you have written or references added so I'm sorry if this doesn't help. But, if you're using Visual Studio 2019 here is a video to help you add the entire framework to your program.
EDIT: If you already have the framework downloaded. What you need to do is right click your project on the right. then Add>Reference.. then search for Microsoft.Xna.Framework.Storage.

I Can't access my class library in a web application

I have added Class Library in my web Project through Add reference option, but i am facing an error
Error 2 The type or namespace name 'UserDetailsDll' could not be
found (are you missing a using directive or an assembly reference?)*
I hope some one will help me.
Thanks in Advance.

There are a few possibilities as to why that is happening:
You're missing a using statement. Try using the whole name of the class (namespace, then class name) you're trying to use.
Your DLL is targeting a different processor architecture. Check the properties of your web application and your DLL and see if they are both targeting the same CPU.
Your DLL is for a different .NET framework than your web application. Check the target framework in the project properties.
Finally, check the references in Visual Studio for a little yellow warning icon next to your referenced DLL. It's presence indicates that the DLL couldn't be found / referenced in the first place.

You need to either add a using in your code file or specify the full name to the class you want to use.
Both solutions can be autogenerated. Rightclick on the class that won't get resolved and click on Resolve -> using XXXX

"microsoft.visualbasic.fileio does not exist" trying to use TextFieldParser

I've seen the above question asked many times on many sites, but I haven't seen an answer that fixed the problem.
The scenario is this...
I am on .NET Framework 4.0, building a C# web application in VisualStudio 2012 Express with the Razor view engine.
I'm trying to use Microsoft.VisualBasic.FileIO.TextFieldParser in my code. From what I've read it is appropriate to do so by adding a project reference to Microsoft.VisualBasic, which I've done, and coding #using Microsoft.VisualBasic; in my view. However when I code...
Microsoft.VisualBasic.FileIO.TextFieldParser parser = new Microsoft.VisualBasic.FileIO.TextFieldParser(new StringReader(xxxxxxxx));
...in the view and rebuild the solution it returns errors: The type or namespace name 'FileIO' does not exist in the namespace 'Microsoft.VisualBasic' (are you missing an assembly reference?)
I know the reference is in the correct project because when I add and remove it I see it come and go from the references folder. I know the code I'm trying to reference exists because I can see it in Object Browser. I've even tried adding the reference using Object Browser instead of through the menus and although it gets added, the results are the same.
The solution it's in is a bit complicated so I tried just creating a test stand alone C# project and I get the same results. I also tried creating a test stand alone Visual Basic project, and sure enough, it works there as advertised. I'm by no means an expert on Visual Studio so I'm guessing that it's just something I'm missing in the configuration, but I'm at a loss to figure it out.
I've spent days on this, so any help anyone could offer would be greatly appreciated.

Right-click on your project and select Add Reference...
In the Reference Manager, expand Assemblies and select Framework. Then check the box for Microsoft.VisualBasic and click OK.
Credit goes to:
https://stackoverflow.com/a/17146200/2530360
I just had the same problem and your question title was more verbose so I figured it should have the answer inside.

Namespace 'SharePoint' does not exist in the namespace 'Microsoft'

So I am starting to learn C#, like literally just started learning, and coming from a Java background, it doesn't look too bad. However, I have a question. I am following THIS tutorial on using the client-object model. And just starting from the top, I added the references, but using Microsoft.SharePoint.Client; keeps giving me the error that "the namespace 'SharePoint' does not exist in the namespace 'Microsoft', but I clearly see it on the right side panel. So looking at the instructions, the only difference I can think of is that fact that I am using Visual Studio Express and thus do not have the option to choose which framework to use when creating a new project. Other than that, I don't know what the problem might be. Does anyone have any ideas on what else I could be missing or how to correct this problem?

Make sure that the target framework is 3.5 and not 4 i.e for SP2010

Did you add the references to the Microsoft.SharePoint.Client assembly and Microsoft.SharePoint.Client.Runtime assembly as noted near the beginning of that tutorial?

Add required references to the solution.
Make sure that the target framework is 4 for SP2013(3.5 for SP2010).

Did you do this part of the tutorial you mentioned above?
To build the application, you must add references to two assemblies,
Microsoft.SharePoint.Client.dll and
Microsoft.SharePoint.Client.Runtime.dll. Installing SharePoint
Foundation installs these assemblies on the server. The two assemblies
are located in the following directory:
%ProgramFiles%\Common Files\Microsoft Shared\web server
extensions\14\ISAPI

Take a look at the references in your project and make sure you have the reference to the assembly. If it is not there try adding it, right click -->add reference and find "Microsoft.SharePoint.Client"

Thanks to those who mentioned the 4.0 framework.
Mine defaulted to .NET Framework 4 Client Profile (and I have no idea what that means), and the Namespaces looked good in Intellisense, but the build would say they weren't found! Crazy.

for anyone developing for SP2019, you need to target .net 4.5

migration problem VS2005 -> VS2010 - missing assembly reference error

I recently migrated a solution from VS2005 to VS2010.
The solution is composed by about 20 project. One of them is in VB.net, the others are C#.
In VS2005 everything was fine, that is I was able to reference the VB.net project into the C Sharp projects. Now I cannot anymore.
The strange thing is that when I open in the editor a C# class referencing the VB.net dll, I get a compile error that sounds more or less like this:
"he type or namespace name 'VB.netProject' does not exist in the namespace 'Solution Namespace' (are you missing an assembly reference?)"
... and no, the assembly reference is there indeed!
However, when I close the files in the editor and try to compile again, the operation succeeds and the executable that I get works perfectly like it did in VS2005.
Is there a way I can manage to see the VB.net component in the editor? I am sure I am missing something, but I don't know what! :-)
Many thanks in advance for your help,
John

Unfortunately the visual studio sets (after the migration) the target framework to .NET Framework 4 Client Profile. If this target framework is set, some namespace could not be found (=> because the client profile doesn't contain this classes). Please verify, if your project has set this target framework. You will find this setting under the project properties.
Kind regards, patrick