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ODP.NET Managed - Unable to find requested .Net Framework Data Provider

Using Visual Studio 2013, I've added the latest version of ODP.NET Managed to a project using Nuget:
Install-Package odp.net.managed
http://www.nuget.org/packages/odp.net.managed/121.1.2
Now, when I try to run the following code:
Database db = DatabaseFactory.CreateDatabase();
It throws the following exception:
An exception of type 'System.ArgumentException' occurred
in System.Data.dll but was not handled in user code
Additional information: Unable to find the requested .Net
Framework Data Provider. It may not be installed.
After reading of other users's similar issues, I added the Managed driver section to C:\Windows\Microsoft.Net\Framework64\v4.0.30319\Config\machine.config:
<system.data>
<DbProviderFactories><add name="Microsoft SQL Server Compact Data Provider 4.0" invariant="System.Data.SqlServerCe.4.0" description=".NET Framework Data Provider for Microsoft SQL Server Compact" type="System.Data.SqlServerCe.SqlCeProviderFactory, System.Data.SqlServerCe, Version=4.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91"/>
<add name="ODP.NET, Managed Driver" invariant="Oracle.ManagedDataAccess.Client" description="Oracle Data Provider for .NET, Managed Driver" type="Oracle.ManagedDataAccess.Client.OracleClientFactory, Oracle.ManagedDataAccess, Version=4.121.1.0, Culture=neutral, PublicKeyToken=89b483f429c47342" />
</DbProviderFactories>
</system.data>
But that had no affect.
I have the connection string specified as such in my web.config, but I'm not sure if it is even looking at the connection string format as it is failing before I open the connection:
<connectionStrings>
<add name="OneCDPBuild"
providerName="Oracle.ManagedDataAccess.Client"
connectionString="Data Source=database;user id=IDhere;pwd=passwordhere;" />
</connectionStrings>
I added the following to my web config:
<system.data>
<DbProviderFactories>
<remove invariant="Oracle.ManagedDataAccess.Client" />
<add name="ODP.NET, Managed Driver"
invariant="Oracle.ManagedDataAccess.Client"
description="Oracle Data Provider for .NET, Managed Driver"
type="Oracle.ManagedDataAccess.Client.OracleClientFactory, Oracle.ManagedDataAccess, Version=4.121.1.0, Culture=neutral, PublicKeyToken=89b483f429c47342" />
</DbProviderFactories>
</system.data>

I was getting this error when deploying an ASP.NET MVC 5 application using EntityFramework 5 to our 64-bit server on which the 64-bit version of the ODAC client components were installed.
I followed b_levitt's advise and confirmed that the connection could be opened manually without using the factories, so the ODAC was installed and working, but the factory methods were unable to locate the assemblies.
After pulling my hair for an undisclosed amount of time, I figured out that the problem was with the machine.config file for the 32-bit version of the .NET framework. It did not include the entries for the oracle providers, so I manually added the following entries to this file:
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config\machine.config
Under
<configuration>
<configSections>
make sure that you have the following two section entires:
<section name="oracle.manageddataaccess.client" type="OracleInternal.Common.ODPMSectionHandler, Oracle.ManagedDataAccess, Version=4.121.1.0, Culture=neutral, PublicKeyToken=89b483f429c47342" />
<section name="oracle.dataaccess.client" type="System.Data.Common.DbProviderConfigurationHandler, System.Data, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" />
You can get the exact entries from your machine.config file under the framework64 folder.
Next, under
<system.data>
<DbProviderFactories>
make sure that you have the following two factory names:
<add name="ODP.NET, Managed Driver" invariant="Oracle.ManagedDataAccess.Client" description="Oracle Data Provider for .NET, Managed Driver" type="Oracle.ManagedDataAccess.Client.OracleClientFactory, Oracle.ManagedDataAccess, Version=4.121.1.0, Culture=neutral, PublicKeyToken=89b483f429c47342" />
<add name="ODP.NET, Unmanaged Driver" invariant="Oracle.DataAccess.Client" description="Oracle Data Provider for .NET, Unmanaged Driver" type="Oracle.DataAccess.Client.OracleClientFactory, Oracle.DataAccess, Version=4.121.1.0, Culture=neutral, PublicKeyToken=89b483f429c47342" />
After adding these entries, everything was working for me.

I would start by doing a direct test and avoiding the factory methods:
var conn = new Oracle.ManagedDataAccess.Client.OracleConnection("your connection string");
conn.Open();
Any issues here will either be related to the Oracle.ManagedDataAccess.dll missing from the bin directory, or connectivity issues caused by the connection string (assuming you can already connect to the oracle instance via other means).
As for the factory, it looks like you're using some out of date enterprise library code. In later versions of the framework I believe you would use:
var factory = DbProviderFactories.GetFactory("ODP.NET, Managed Driver");
var conn = factory.CreateConnection();
I think if you take it one step at a time you'll get better feedback.

I solved mine changing the IIS Application Pool configuration for Enable 32-bit Application to FALSE.
I was getting the exception Failed to find or load the registered .Net Framework Data Provider because the ODAC I installed is for 64-bit, and my app pool was making the app run at 32-bit.

SQLite Error: The 'DbProviderFactories' section can only appear once per config file (IBM Client Access)

I'm using for my application Entity Framework and System.Data.SQLite using WPF and C# on .NET 4.5
On my machine al work well, but on a test machine a received this error when I access to the sqlite db via EntityFramework:
The 'DbProviderFactories' section can only appear once per config
file.
I found that the error was that in the test machine, in the machine.config:
<system.data>
<DbProviderFactories>
<add name="IBM DB2 for i5/OS .NET Provider" invariant="IBM.Data.DB2.iSeries" description=".NET Framework Data Provider for i5/OS" type="IBM.Data.DB2.iSeries.iDB2Factory, IBM.Data.DB2.iSeries, Version=12.0.0.0, Culture=neutral, PublicKeyToken=9cdb2ebfb1f93a26"/>
<add name="Microsoft SQL Server Compact Data Provider" invariant="System.Data.SqlServerCe.3.5" description=".NET Framework Data Provider for Microsoft SQL Server Compact" type="System.Data.SqlServerCe.SqlCeProviderFactory, System.Data.SqlServerCe, Version=3.5.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91"/>
<add name="IBM DB2 for i .NET Provider" invariant="IBM.Data.DB2.iSeries" description=".NET Framework Data Provider for IBM i" type="IBM.Data.DB2.iSeries.iDB2Factory, IBM.Data.DB2.iSeries, Version=12.0.0.0, Culture=neutral, PublicKeyToken=9cdb2ebfb1f93a26" />
</DbProviderFactories>
<!-- This is the line to remove - empty element -->
<DbProviderFactories/>
</system.data>
I remove the last empty element and now all work.
I think it's something related the IBM.Data.DB2.iSeries installation (IBM Client Access).
My question is:
How to remove the empty element without manually edit machine.config? I have tried to insert the tag <clear /> in the app.config file but not work.
I found another question similar to mine but not one suggest how to solve the problem without edit manually the machine.config to solve the problem.
this is my app.config file:
<?xml version="1.0" encoding="utf-8"?>
<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=5.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<system.xml.serialization>
<xmlSerializer useLegacySerializerGeneration="true" />
</system.xml.serialization>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
<!--STAI MOLTO ATTENTO-->
<legacyUnhandledExceptionPolicy enabled="1"/>
</startup>
<connectionStrings>
<add name="db" connectionString="Data Source=clients.db;Version=3;New=False;Compress=True;" />
<add name="icmdbEntities" connectionString="metadata=res://*/MainModel.csdl|res://*/MainModel.ssdl|res://*/MainModel.msl;provider=System.Data.SQLite;provider connection string="data source=.\icmdb.db"" providerName="System.Data.EntityClient" />
</connectionStrings>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
<parameters>
<parameter value="v11.0" />
</parameters>
</defaultConnectionFactory>
</entityFramework>
<system.data>
<DbProviderFactories>
<clear />
<remove invariant="System.Data.SQLite" />
<add name="SQLite Data Provider" invariant="System.Data.SQLite" description=".Net Framework Data Provider for SQLite" type="System.Data.SQLite.SQLiteFactory, System.Data.SQLite" />
</DbProviderFactories>
</system.data>
<appSettings>
<add key="ditta" value="default" />
<add key="demo" value="true"/>
<add key="ClientSettingsProvider.ServiceUri" value="" />
</appSettings>
<system.web>
<membership defaultProvider="ClientAuthenticationMembershipProvider">
<providers>
<add name="ClientAuthenticationMembershipProvider" type="System.Web.ClientServices.Providers.ClientFormsAuthenticationMembershipProvider, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" serviceUri="" />
</providers>
</membership>
<roleManager defaultProvider="ClientRoleProvider" enabled="true">
<providers>
<add name="ClientRoleProvider" type="System.Web.ClientServices.Providers.ClientRoleProvider, System.Web.Extensions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" serviceUri="" cacheTimeout="86400" />
</providers>
</roleManager>
</system.web>
</configuration>

I experienced this problem today.
The machine.config files are located in:
C:\Windows\Microsoft.NET\Framework\v2.0.50727\CONFIG\machine.config
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config\machine.config
C:\Windows\Microsoft.NET\Framework64\v2.0.50727\CONFIG\machine.config
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Config\machine.config
The corrupted version of machine.config contains:
<system.data>
<DbProviderFactories>
<add name="IBM DB2 for i .NET Provider" invariant="IBM.Data.DB2.iSeries" description=".NET Framework Data Provider for IBM i" type="IBM.Data.DB2.iSeries.iDB2Factory, IBM.Data.DB2.iSeries, Version=12.0.0.0, Culture=neutral, PublicKeyToken=9cdb2ebfb1f93a26" />
</DbProviderFactories>
<DbProviderFactories/>
</system.data>
Installing the iSeries drivers corrupted the following machine.config files:
| Framework | Platform | Factory Added? | Corrupted Machine.config? |
|-----------|----------|----------------|---------------------------|
|v4.0.30319 | x64 | Yes | Yes |
|v4.0.30319 | x86 | Yes | Yes |
|v2.0.50727 | x86 | No | No |
|v2.0.50727 | x64 | No | No |
It's nice that you only have to worry about IBM corrupting half your machine.config files; and of those only applications that use .NET 4.
Files to fix
C:\Windows\Microsoft.NET\Framework\v2.0.50727\CONFIG\machine.config (ok)
C:\Windows\Microsoft.NET\Framework\v4.0.30319\Config\machine.config (ok)
C:\Windows\Microsoft.NET\Framework64\v2.0.50727\CONFIG\machine.config (corrupt)
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Config\machine.config (corrupt)
From an elevated Notepad, open the two files, and remove the extraneous empty <DbProviderFactories/> element, leaving you with:
<system.data>
<DbProviderFactories>
<add name="IBM DB2 for i .NET Provider" invariant="IBM.Data.DB2.iSeries" description=".NET Framework Data Provider for IBM i" type="IBM.Data.DB2.iSeries.iDB2Factory, IBM.Data.DB2.iSeries, Version=12.0.0.0, Culture=neutral, PublicKeyToken=9cdb2ebfb1f93a26" />
</DbProviderFactories>
</system.data>
And you're fixed.

The problem is caused by installing IBM iAccess for Windows -- specifically the .NET Provider for DB2 component. I've seen it firsthand in V7R1, but others have referenced the same issue with V6R1.
IBM is aware of the problem and has a fix in one of the service releases.
From the V7R1 service release documentation:
DESCRIPTION OF PROBLEM FIXED FOR APAR SE45767 :
Under unknown circumstances, corruption to the machine.config XML file is occurring when the .Net data provider is installed (either as part of a Complete or Custom install type). The corruption is isolated to portions of the XML data related to the DbProviderFactories - and generally has been observed to include duplication of some lines of the XML data.
CORRECTION FOR APAR SE45767 :
A preventive fix will be provided which will eliminate the likely cause of the machine.config corruption.
A corrective fix to update already corrupted machine.config files will not be provided. Utilize the documented local fix or circumvention if possible.
CIRCUMVENTION FOR APAR SE45767 :
If the .Net data provider is not needed, this problem may be avoided by performing a custom install and ensuring the .Net Data provider will not be installed. If the .Net provider is required, no circumvention is known. Utilize the local fix to resolve the issue.
As for fixing the problem once it has occurred, you need to fix machine.config (both 32-bit and 64-bit), because it does not conform to the schema defined for system.data. That's easy -- just write a simple .NET app that uses XmlDocument to load machine.config, locate the duplicate DbProviderFactories element, delete it and save the file. Or use a PowerShell script or anything else that can manipulate XML documents.
Here's an IBM APAR discussing this issue in V6R1.

InvalidCastException in Windows Azure connecting to MySQL DB

I have just started using Azure and I am having a problem accessing the MySQL DB I set up. It appears as if Azure is referencing the MySQL.Data.dll version 6.5.4 instead of the version I require, MySQL.Data.dll v6.8.3. I receive the following error:
MySql.Data.MySqlClient.MySqlConnection cannot be cast to
MySql.Data.MySqlClient.MySqlConnection. Type A originates from
'MySql.Data, Version=6.5.4.0, Culture=neutral,
PublicKeyToken=c5687fc88969c44d' in the context 'Default' at location
'D:\Windows\Microsoft.Net\assembly\GAC_MSIL\MySql.Data\v4.0_6.5.4.0__c5687fc88969c44d\MySql.Data.dll'.
Type B originates from 'MySql.Data, Version=6.8.3.0, Culture=neutral,
PublicKeyToken=c5687fc88969c44d' in the context 'Default' at location
'C:\DWASFiles\Sites\test\Temporary ASP.NET
Files\root\fc8f3c27\4f9201b0\assembly\dl3\ca8ec5e2\74482a5e_285fcf01\MySql.Data.dll'.
I tried using my application with v6.5.4 but I require v6.8.3 for it to work. Numerous searches have not revealed a solution. Does anyone have any ideas? The checked using Web Matrix that the version in the bin directory is 6.8.3. How can I reference this correct dll?

I had the same problem.
The problem is that on the server there is installed a lower version of the MySql library.
You can bypass this modifying your web.config file:
<system.data>
<DbProviderFactories>
<remove invariant="MySql.Data.MySqlClient" />
<add name="MySQL Data Provider" invariant="MySql.Data.MySqlClient" description=".Net Framework Data Provider for MySQL" type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data, Version=6.8.3.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" />
</DbProviderFactories>
</system.data>

EntityFramework,The specified store provider cannot be found in the configuration, or is not valid

I have a Winform application and am using EntityFramework. The application runs just fine in my dev machine but when I try to run at client's machine I get "The specified store provider cannot be found in the configuration, or is not valid" error. I have distributed EntityFramework.dll with the client. Why am I getting this error? I am not putting the connection strings in the app.config file as it is dynamically created based on the database selected at runtime.(I am using VistaDB as database)
The app.config is below:
<configuration>
<configSections>
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection,EntityFramework, Version=4.4.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<connectionStrings>
</connectionStrings>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
</entityFramework>
</configuration>

I had this problem. I uninstalled Connector .NET and reinstalled it. Now it works.

based on which type of DataBase you use you need to provide Db ORM settings that is going to used by Entityframe work
<system.data>
<DbProviderFactories>
<remove invariant="MySql.Data.MySqlClient" />
<add name="MySQL Data Provider" invariant="MySql.Data.MySqlClient" description=".Net Framework Data Provider for MySQL" type="MySql.Data.MySqlClient.MySqlClientFactory,MySql.Data" />
</DbProviderFactories>
</system.data>

To solve this error, install Microsoft SQL Server Compact 4.0 on your client's computer.

Linq to Entities strange deploying behavior

Hi I started building apps with this technology and I am facing a weird problem... on some machines I need to add theese lines to the app.config to get to work:
<system.data>
<DbProviderFactories>
<add name="MySQL Data Provider" invariant="MySql.Data.MySqlClient" description=".Net Framework Data Provider for MySQL" type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data, Version=6.3.0.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" />
</DbProviderFactories>
</system.data>
while in other machines it runs well without theese lines.... the thing is that when I add theese lines the app wont run on machines that did not needed theese lines in the firs place, and I would like not to publish to versions of the app, is there a way to solve this?
Any Help would be appreciated!!!

Would post as comment but i can't yet.**
It could be your machine.configs are different. I would check to make sure your DbProviderFactories are registered consistently in the machine.config.

Did you try removing it?
<system.data>
<DbProviderFactories>
<remove invariant="MySql.Data.MySqlClient"/>
<add name="MySQL Data Provider" invariant="MySql.Data.MySqlClient" description=".Net Framework Data Provider for MySQL" type="MySql.Data.MySqlClient.MySqlClientFactory, MySql.Data, Version=6.3.0.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d" />
</DbProviderFactories>
</system.data>