C# Added MySQL Reference Into C# Still Not Recognizing MYSQL - c#

using MySql.Data.MySqlClient;
References
It is referenced, I have downloaded the connector, yet it refuses to work. I rebuilt and cleaned, doesn't work.
The type or namespace name 'MySql' could not be found (are you missing a using directive or an assembly reference?)

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The type or namespace name 'NUnit' could not be found | Unity

i have next errors:
The type or namespace name 'NUnit' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'UnitySetUpAttribute' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'UnitySetUp' could not be found (are you missing a using directive or an assembly reference?)
The type or namespace name 'TestAttribute' could not be found (are you missing a using directive or an assembly reference?)
More under a page:
enter image description here
Code:
https://pastebin.com/5zTjwPZw
How fix it?

I had the same issue in a custom package after updating to 2020.2.3f1.
In the case of packages (or if you are using assemblies), they now seem to enforce that Editor's only assemblies should be marked as such in the Platforms section of the inspector:

Test code needs to be under Editor, so it compiles to the Assembly-CSharp-Editor-*.dll which has references to the nunit dlls.
I find this particularly confusing given a quick inspection of Assembly-CSharp-*.csproj will show the nunit.framework listed as a reference, and the fact that it will also build if you point msbuild at the generated solution within vscode (whilst simultaneously failing a Unity 'refresh').

Error CS0246 The type or namespace name 'Windows' could not be found (are you missing a using directive or an assembly reference?)

I want to run the Xamarin project and did all the updates. When I run the project I get the following error
The type or namespace name 'Windows' could not be found (are you missing a using directive or an assembly reference?)
for the lines
using Windows.Storage;
using Windows.ApplicationModel.ExtendedExecution;

That's because you're missing these .dll
The recommended steps to get access to UWP APIs are listed in the dedicated blog post on Windows Blog.
Basically you can take two approaches: add the references to UWP dlls and winmd files manually or use the UwpDesktop NuGet package that will take care of this for you automatically.
For more details, you can check: How do I get access to Windows.Storage namespace?

Trying to get started win ASP.NET core and azure table storage

I'm following this guide How to get started with Azure Table storage and Visual Studio connected services. The very first code that I add:
using Microsoft.Framework.Configuration;
using Microsoft.WindowsAzure.Storage;
using Microsoft.WindowsAzure.Storage.Table;
using System.Threading.Tasks;
using LogLevel = Microsoft.Framework.Logging.LogLevel;
Gives an error:
Error CS0234 The type or namespace name 'Framework' does not exist in
the namespace 'Microsoft' (are you missing an assembly reference?)
I've looked in NuGet for the Microsoft.Framework and couldn't find it. What am I missing here? is this guide no longer relevant?

Use this command to install this framework
PM> Install-Package Microsoft.Framework.Logging -Pre

Based on your description, you have followed the get started article to add the assembly. I test on my local everything works fine. As my test, if you missing Microsoft.Framework.Logging, you will get the error:The type or namespace name 'Logging' does not exist in the namespace 'Microsoft.Framework' (are you missing an assembly reference?). If you missing Microsoft.Framework.Configuration.Json, you will get the error:The type or namespace name 'Configuration' does not exist in the namespace 'Microsoft.Framework' (are you missing an assembly reference?). So I could not reproduce your issue. I would recommend you to check your application whether it would work Before ‘Add Connected Services’. If you just learn how to Add Connected Services’, it is a good choice to create a new template to test.

CS0246: The type or namespace name 'MySql' could not be found (are you missing a using directive or an assembly reference

CS0246: The type or namespace name 'MySql' could not be found (are you missing a using directive or an assembly reference![enter image description here][1]
this is the problem i get
i have tried and tried
The biggest problem is this works on my computer the remote server

You need to reference the mysql library. Install the nuget package manager and run the following:
Install-Package MySql.Data
See here

Error when building iConf.NET Demos. Namespace name 'iConfServer' cannot be found

I am trying to build iConf.NET demo for video conferencing SDK.
The projects have references to assemblies named:
iConfClient.NET.dll
iConfServer.NET.dll
The references are ok.
In code there are following lines:
using iConfServer.NET.HelperClasses;
..etc, which are causing the errors of type
The type or namespace name 'iConfServer' could not be found (are you missing a using directive or an assembly reference?)
C:\Users\Администратор\Desktop\iConfNetSDKDemos\PictureInPictureVideoPhone\MainForm.cs
Any help will be appreciated

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