Develop Reference

error CS0234: The type or namespace name 'Devices' does not exist in the namespace 'Microsoft.VisualBasic' (are you missing an assembly reference?)

I am trying to go through this tutorial for on making sounds with waves using C#:
https://www.codeguru.com/dotnet/making-sounds-with-waves-using-c/
The first sample code it has you run is this, which is supposed to play a .wav file:
using Microsoft.VisualBasic;
using Microsoft.VisualBasic.Devices;
namespace MyApp
{
class Program
{
static Audio myAudio = new Audio();
static void Main()
{
myAudio.Play("m:\\crooner2.wav",
AudioPlayMode.WaitToComplete);
}
}
}
In my code, the filepath and name of the .wav file was replaced with a different one, but otherwise the code is identical. However, I get an error regarding the second line of code: error CS0234: The type or namespace name 'Devices' does not exist in the namespace 'Microsoft.VisualBasic' (are you missing an assembly reference?)
Without the Microsoft.VisualBasic.Devices call working, I have no way of running even the first exercise in the tutorial, and definitely no way of further progressing in using C# for sound manipulation.
I was expecting the code to run and play the .wav file. However, I got the error message instead.
As part of debugging, I came across this post on the Microsoft website:
https://learn.microsoft.com/en-us/dotnet/core/compatibility/visualbasic#types-in-microsoftvisualbasicdevices-namespace-not-available
I'm not sure what to make of it. It seems like it's saying it could be solved by upgrading to .Net 5 or higher, but I'm already using .Net 5. It also seems like it saying that Microsoft.VisualBasic.Devices was made obsolete with .Net Core 3.0, so I'm not sure how upgrading would make it easier to use something that was made obsolete.
It also says that certain functionality in Microsoft.VisualBasic.Devices has equivalent functionality that can be called by other means. It gives specific replacement calls for Microsoft.VisualBasic.Devices.Clock and Microsoft.VisualBasic.Devices.Ports, but nothing for Microsoft.VisualBasic.Devices.Audio, which is what I want to use in my code.
I have tried this in both Visual Studio and Visual Studio Code and get the same errors either way.

With .NET Core, you generally add references via NuGet packages. There is no NuGet package for Microsoft.VisualBasic.Forms.dll, which the documentation clearly states that type is declared in. To get that assembly reference, I believe that you need to replace this line in your project file:
<TargetFramework>net5.0</TargetFramework>
with these lines:
<TargetFramework>net5.0-windows</TargetFramework>
<UseWindowsForms>true</UseWindowsForms>
After doing that, you should see Microsoft.WindowsDesktop.App.WindowsForms added under Dependencies -> Frameworks in the Solution Explorer and the relevant assembly is listed under that.

You have to use reference to "Microsoft.VisualBasic" in your project.
You have two way for do that :
1st way :
Right click on project references, select "Assemblys" => "Framework" and you can search (at top right) "basic" keyword, and select "Microsoft.VisualBasic" item.
After that you can compile your project and normally its works !
Screen for add references
2nd way :
Comment or delete "using Microsoft.VisualBasic.Devices;" instruction.
The class "Audio" should be underline to red, hover with your mouse and you have option by IDE which let you "using Microsoft.VisualBasic.Devices;".
References should be automatically added in project.
And now you can compile your project.

How to solve 'AlprNet' could not be found?

I looked for the answers here and there with no luck, so I decided to ask out.
I want to implement openalpr (open source Automatic License Plate Recognition)
repository on my own PC and I am following this video to accomplish the task. I have done all the steps he did and at the end, when I tried to build it but, in one of the .cs code there is CS0246 error that says:
Error CS0246 The type or namespace name 'AlprNet' could not be found (are you missing a using directive or an assembly reference?) number_plate c:\users\sohib\documents\visual studio 2015\Projects\number_plate\number_plate\Form1.cs
I could only find AlprNet in my D:\Projects\plate_recognition\openalpr-master\src\bindings\csharp\AlprNetTest and it is in .csproj format.
AlprNet is not in .dll format like other references so I cannot reference it in References.
I found some say that it might be because of different versions of .NET Framework platforms. I almost did nothing to check that, because I don't think it's related to .NET
In my mere opinion I should link that AlprNet.csproj to get its content, but I'm not sure. If someone can help get around this issue, I'd be very grateful.

If it's not a .net Assembly (dll) that's referenced and it's not a nuget package, then check that the code isn't expecting the Assembly to already be present in the Global Assembly Cache (If you have access to another developer machine where this works, this is easy to check).
Failing that, adding the .csproj to your .sln and then referencing it sounds like the way to go (provided you have access to that of course!).

MySql.Data.MySqlClient Reference Not Working in Visual Studio 2015

I've been attempting to connect a MySql database to my project in Visual Studio 2015. In order to connect it in the Server Explorer, I had to download and add the reference to my project. Easy peasy.
Then, when I attempted to follow this tutorial, I get this error message:
The type or namespace name 'MySqlConnection' could not be found (are you missing a using directive or an assembly reference?)
I have indeed added the assembly reference (I believe, if I understand the term correctly), by checking the MySql.Data in the References/Extension.
Am I using the wrong MySql.Data? How do I know which one? I've read that perhaps it can have to do with mixed versions of .NET Frameworks, but honestly I don't know how to check.
I'm an up-and-coming programmer, who before this, had only worked with static, hard-coded webpages, and never used databases in a project before.
EDIT: I have indeed added the 'using MySql.Data.MySqlClient to the same class file as I am attempting to use it in.
More information. What is displayed when I hover over the Data in MySql.Data.MySqlClient in the 'using' statements.

Your first screenshot shows the quickactions window suggesting that you use a fully qualified name, for the type, because it cannot determine where the type comes from.
Search to make sure that MySql.Data is not used, as a namespace, elsewhere in your project, so that it does not collide with the MySql.Data namespace from the dll you are referencing.

I am *not* missing an assembly or reference

I'm using Visual Studio 2013, and I'm getting an error in my C# code that I can't figure out. I'm working with the Microsoft Kinect SDK, but I'll keep it general.
I downloaded the SDK, and I can get the included sample programs to build and run. But when I try to use the code in my own project, I get the
Type or namespace name 'Kinect' does not exist in the namespace 'Microsoft' (Are you missing an assembly reference)
error.
The thing is, I'm not missing an assembly or reference. I have it added to the project's references, and the path is valid. Also, the using statements at the top of the file will autocomplete to "Kinect" for me. If I start typing using Microsoft., Kinect will appear as an autocomplete option.
What are the steps to debugging an error such as this? Could it be a 32/64 bit issue? I tried using Dependency Walker to look at the Kinect DLL, and while it throws some errors (Error: Modules with different CPU types were found.), it doesn't show any issues that I don't see with other DLLs that I'm using successfully.
What are some other potential issues that might cause a problem with DLLs not being recognized?

1 - Try going to your project settings and verify the version of the .NET framework it uses.
The best to do is to choose the same version as the external libraries.
If it's a client profile, it will very often bring that exact problem. (I'm not sure what the client profile is, but I ended up never using it...)
2 - Check if any of your references got an exclamation mark.

This should not be happening. Outlook addin can't find assembly reference?? Why?

I can not work this out. I have a class library called 'ABC.Service'. In this class library I have referenced other projects from my solution.
In my 'ABC.Service' I have consistently named my classes namespace 'ABC.Service'.
I have made a project reference to this 'ABC.Service' and another class library called 'ABC.Entities' from a OutlookAddin project in the same solution.
For some reason the outlook addin project does not compile and outputs that 'The type or name 'Service' does not exist in the namespace 'ABC' (are you missing an assembly reference?) . However it does not complain about the 'ABC.Entities' classes???
The 'ABC.Service' compiles just fine and can be referenced successfully from a Windows project in the same solution which compiles just fine.
In the outlook addin intellisense can detect the namespace and class just fine also
I am obviously not missing the reference so the error message is so misleading.
I have tried;
Cleaning project/solution
Shutting down VS2010
Restarting Computer
I can only see 2 possible problems (which I can not understand why they would be problems)
In the 'ABC.Service' I have a
reference to
'Micorosoft.Office.Interop.Word'
assembly.Could this be doing
something?
I have some generated code with a
namespace called 'ABC.BusinessLogic'
instead of 'ABC.Service' - removing
this generated code to see if this is
the problem would be a nightmare as
much more would need to be changed to
get it to compile and I really don't
understand why it would be a problem
Has anyone got any ideas??
Any help appreciated

I've heard of this sort of thing happening when a project's build mode gets changed to "Client Profile." You might want to check on that.