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The ADO.NET provider with invariant name 'System.Data.SqlClient' is either not registered

I have a .NET Core React Web application that calls into a Class Library with a reference to the Entity Framework. I'm using a database that is stored in Azure, and every time I query my database, I get this exception:
System.ArgumentException: 'The ADO.NET provider with invariant name 'System.Data.SqlClient' is either not registered in the machine or application config file, or could not be loaded. See the inner exception for details.'
InnerException: ArgumentException: The specified invariant name 'System.Data.SqlClient' wasn't found in the list of registered .NET Data Providers.
I'm thinking I don't have something configured properly in my Web.config/App.config files but I'm not sure.
Web.config file in my web app:
<configuration>
<connectionStrings>
<add name="JATEntities"
connectionString="Server=tcp:[someserver].database.windows.net,1433;Database=JAT;persist security info=True;user id=[userid];password=[password];MultipleActiveResultSets=True;"
providerName="System.Data.SqlClient" />
</connectionStrings>
</configuration>
My App.Config in my class library:
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<connectionStrings>
<add name="JATEntities"
connectionString="Server=tcp:[someserver].database.windows.net,1433;Database=JAT;persist security info=True;user id=[userid];password=[password];MultipleActiveResultSets=True;"
providerName="System.Data.SqlClient" />
</connectionStrings>
<entityFramework>
<providers>
<provider invariantName="System.Data.SqlClient"
type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
</providers>
</entityFramework>
</configuration>
Here's the code that I'm calling in my class library:
public class MyClass
{
// I've tried this as it seems to have worked for some people
private static string __hack = typeof(SqlProviderServices).ToString();
public void MyMethod()
{
using (var context = new JATEntities())
{
var query = from listing in context.CurrentListings
where listing.Id == id
select listing;
}
}
}
I've also referenced the App.config file from my ClassLibrary into my Web App project, but that doesn't seem to help.
[External Code]
JAT.DB.dll!JAT.DB.Repo.Repo.GetCurrentListingById(int id) Line 22
at C:\Users\Jungle\source\repos\JAT\JAT.DB\Repo\Repo.cs(22)
JAT.Client.dll!JAT.Client.Controllers.SearchController.FirstMethod() Line 25
at C:\Users\Jungle\source\repos\JAT\JAT.Client\Controllers\SearchController.cs(25)
[External Code]

What worked for me was upgrading to Visual Studio 2019, and creating a new .Net core web application and .net core class library and then moving all my code from my old solution into the new one.

Cannot connect asp.net web forms to local mySQL db

I have wasted nearly a month trying to resolve this issue and have had no luck. I think I have tried everything I can find in the forums.
So at the moment all I want to be able to do is have my asp.net web forms connect to my local database and to be able to use the asp.net Identity.
I am using Visual Studio Community 2017 (Version 15.9.3) and have downloaded the latest MySQL Workbench 8.0 (Version 8.0.13) also downloaded the latest MySql.Data.dll (Version 8.0.11.0).
So that I can be sure that it is not something I have done else where in my project I have created a new asp.net web app (.net framework). I have selected web forms and changed the Authentication to Individual User Accounts.
In web config I have changed the following:
<configSections>
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<connectionStrings>
<add name="DefaultConnection" connectionString="server=localhost;User Id=root;password=****;database=testdb" providerName="MySql.Data.MySqlClient" />
</connectionStrings>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
<providers>
<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
<provider invariantName="MySql.Data.MySqlClient" type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6, Version=6.8.3.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d"></provider>
</providers>
</entityFramework>
Within mysql workbench I have created a new Schema called testdb.
When I run the project I get this error
System.InvalidOperationException: 'The Entity Framework provider type 'MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6, Version=6.8.3.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d' registered in the application config file for the ADO.NET provider with invariant name 'MySql.Data.MySqlClient' could not be loaded. Make sure that the assembly-qualified name is used and that the assembly is available to the running application. See http://go.microsoft.com/fwlink/?LinkId=260882 for more information.'
I have followed the link the error gives me but I am not sure exactly what it is telling me, I know some people will tell me it is given me the answer but I have spent so much time reading it I have no idea what it is telling me now. I am not asking for people to give me the but I really do need some help.
Edit:
Thank you Bradley and SH7 that got the web site started with out an error, now I am not sure if I need to start a new question here, but when I click on Register and enter my email and password it gives me this error.
System.Data.Entity.Core.EntityCommandExecutionException: 'An error occurred while executing the command definition. See the inner exception for details.'
MySqlException: Table 'testdb.aspnetusers' doesn't exist
Yes I know that means that the table does not exists, but I was under the impression that when you first register a user it would create all the tables needed for Identity.. While I am waiting for help I will add a new table and see if I can connect to that.

Getting an error from Entity Framework(type initializer exception)

I' am getting this:
The type initializer for 'System.Data.Entity.Internal.AppConfig' threw an exception.
error in my Entity Framework.
I read this Question and the possible answers, however non of them worked for me. Here is my App.config file:
<configuration>
<configSections>
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<connectionStrings>
<add name="SalesReportEntities"
connectionString="metadata=res://*/SalesReportModel.csdl
|res://*/SalesReportModel.ssdl
|res://*/SalesReportModel.msl;
provider=System.Data.SqlClient;
provider connection string="data source=.;
initial catalog=Training;
integrated security=True;
MultipleActiveResultSets=True;
App=EntityFramework""
providerName="System.Data.EntityClient" />
</connectionStrings>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
<parameters>
<parameter value="v11.0" />
</parameters>
</defaultConnectionFactory>
<providers>
<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
</providers>
</entityFramework>
</configuration>
What other possible things can cause this error?

I can offer a few suggestions and some are similar to the thread you already looked at:
Can you use SQL Management Studio and verify this database exists and has tables and is currently in a responsive state?
Put your 'connectionStrings' section after the < providers > node.
Your parameter value is 'v11.0' which seems to be targeting a version of SQL Server 2012. Mine that I am looking at now is similar to yours but just states: "mssqllocaldb". Which I believe is just the default instance of sql server from the connection you specify.
Uninstall Entity Framework completely and get it again from NuGet. I assume you are using Visual Studio so in 2015 it is Tools>NuGet Package Manager>Manage NuGet Packages. Uninstall, check your app config and 'References' that 'EntityFramework' is gone. Reinstall and check your settings again.
Are you trying to reference a project that entity lives in in another project or is it self contained? If so you need to target EF just like you were on the source project with adding EF to that project and a config the same.
You may also want to post the entire exception for better answers too.

SQL Server Object Explorer not showing a database

It's a very small code-first EF6 Project. I added a migration and updated a database successfully. Here's the output:
PM> update-database -Verbose
Using StartUp project 'ChattyServer'.
Using NuGet project 'ChattyDataModel'.
Target database is: 'ChattyDataModel.ChattyContext' (DataSource: .\SQLEXPRESS, Provider: System.Data.SqlClient, Origin: Convention).
No pending explicit migrations.
Running Seed method.
However, when I open the SQL Server Object Explorer, I can't find my database:
UPD: The app.config - which connection string should I use for LocalDb?
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<configSections>
<section name="entityFramework"
type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 --></configSections>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
<providers>
<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
</providers>
</entityFramework>
</configuration>
UPD: Updated the app.config, added:
<connectionStrings>
<add name="DbConnect"
connectionString="Data Source=(localdb)\ProjectsV13;Initial Catalog=master;Integrated Security=True;ConnectTimeout=30;Encrypt=False;TrustServerCertificate=True;ApplicationIntent=ReadWrite;MultiSubnetFailover=False" />
</connectionStrings>
Then created a new migration and updated a database. No changes in the SQL Server Object Explorer
UPD I changed the directory from master to chatty, created a new migration and updated the db-still can't see db in the SQL Server Object Explorer

Firstly: You are using the Master database. Check this post to know how to set your connection string: Cant find my EF code first database.
Secondly: You didn't connect to SQLEXPRESS:
In your Server Explorer click on Connect to Database.
Then in the Server name type .\sqlexpress
Then Test Connection.
then in the Select or enter a database name you should get your
database.

I had the same problem and found that I hadn't connected SSOX to the right instance of SQL Server. I had my older full version connected, not the SQL Express. The program was functioning perfectly but not on the db I was looking at!
I connected to (my pc)\SQLExpress and voila! I could see my database! slaps forehead
Hope that helps someone else with the same problem.

Code-first EF database not auto-generating on startup

I have a new ASP.NET web application I am calling "Smartifyer" that was empty to start with. I added EntityFramework with Nuget and have created a model called WordModel and the following context:
public class SmartifyerContext : DbContext
{
public SmartifyerContext()
: base("SmartifyerDatabase")
{
}
public DbSet<WordModel> Words { get; set; }
}
Within Web.config in the root directory I have the following configurations:
<configuration>
<configSections>
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<connectionStrings>
<add name="SmartifyerDatabase"
connectionString="Data Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\SmartifyerDb.mdf;Integrated Security=True"
providerName="System.Data.SqlClient"/>
</connectionStrings>
<system.web>
<compilation debug="true" targetFramework="4.5" />
<httpRuntime targetFramework="4.5" />
</system.web>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
<parameters>
<parameter value="mssqllocaldb" />
</parameters>
</defaultConnectionFactory>
<providers>
<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
</providers>
</entityFramework>
</configuration>
When running a test on the context, the Find method takes about 30 seconds until it times out with the following error:
System.Data.SqlClient.SqlException: A network-related or
instance-specific error occurred while establishing a connection to
SQL Server. The server was not found or was not accessible. Verify
that the instance name is correct and that SQL Server is configured to
allow remote connections. (provider: SQL Network Interfaces, error: 26
- Error Locating Server/Instance Specified)
I have a pretty poor understanding of setting up SQL connections and what all the configurations within Web.config do. I would like the .mdf database file to be auto-generated if it is not present but I am unsure how to modify my configurations to do that.
EDIT WITH SOLUTION:
All of my connection config and database stuff was setup correctly. My problem was that I was running a unit test which was using the test project's app.config file rather than the main project's web.config. Copy and pasting my web.config into the test project's app.config fixed the issue!

The error you're getting is because the EF is not able to locate the database instance service. The EF have default connection string that connects to developer database known as LocalDB\V11.0. Here your application is trying to connect to LocalDB\V11.0 as specified in ConnectionString.
<add name="SmartifyerDatabase" connectionString="Data Source=(LocalDB)\v11.0; ......
You must ensure that LocalDB instance is installed on you machine. see this answer. If it's not there install it and try to connect manually to the LocalDB instance then try with the application. Hope this will resolve your issue.
For information about the SQL LocalDB see this MSDN article.
You can also use your SqlExpress or other Sql database if it's installed on your machine. Just change the DataSource property in the connectionstring and you will be good to go.