c# - The 'Microsoft.ACE.OLEDB.12.0' provider is not registered on the local machine (server)

Question

I know that is this question has dozen of answers and posts, but nothing works for me.

I have my MVC 5 application and I deploy it to the IIS 7.5 to my server. Application runs great, everything is works until I go to the Action, where I use ACE.OLEDB.

I'm getting this error:

[InvalidOperationException: The 'Microsoft.ACE.OLEDB.12.0' provider is not registered on the local machine.]
System.Data.OleDb.OleDbServicesWrapper.GetDataSource(OleDbConnectionString constr, DataSourceWrapper& datasrcWrapper) +1785474
System.Data.OleDb.OleDbConnectionInternal..ctor(OleDbConnectionString constr, OleDbConnection connection) +1802032
System.Data.OleDb.OleDbConnectionFactory.CreateConnection(DbConnectionOptions options, DbConnectionPoolKey poolKey, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningObject) +100
System.Data.ProviderBase.DbConnectionFactory.CreateNonPooledConnection(DbConnection owningConnection, DbConnectionPoolGroup poolGroup, DbConnectionOptions userOptions) +61
System.Data.ProviderBase.DbConnectionFactory.TryGetConnection(DbConnection owningConnection, TaskCompletionSource`1 retry, DbConnectionOptions userOptions, DbConnectionInternal oldConnection, DbConnectionInternal& connection) +964
System.Data.ProviderBase.DbConnectionInternal.TryOpenConnectionInternal(DbConnection outerConnection, DbConnectionFactory connectionFactory, TaskCompletionSource`1 retry, DbConnectionOptions userOptions) +6785863
System.Data.ProviderBase.DbConnectionInternal.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +27
System.Data.OleDb.OleDbConnection.Open() +47
QuickbookUploadFromElite3e.Controllers.HomeController.Matters(String filePath) in c:Usersalex.chakhauDocumentsVisual Studio 2013ProjectsQuickbookUploadFromElite3eQuickbookUploadFromElite3eControllersHomeController.cs:75
lambda_method(Closure , ControllerBase , Object[] ) +127
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +242
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +39
System.Web.Mvc.Async.AsyncControllerActionInvoker.<BeginInvokeSynchronousActionMethod>b__36(IAsyncResult asyncResult, ActionInvocation innerInvokeState) +12
System.Web.Mvc.Async.WrappedAsyncResult`2.CallEndDelegate(IAsyncResult asyncResult) +139
System.Web.Mvc.Async.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3c() +112
System.Web.Mvc.Async.<>c__DisplayClass45.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3e() +452
System.Web.Mvc.Async.<>c__DisplayClass30.<BeginInvokeActionMethodWithFilters>b__2f(IAsyncResult asyncResult) +15
System.Web.Mvc.Async.<>c__DisplayClass28.<BeginInvokeAction>b__19() +37
System.Web.Mvc.Async.<>c__DisplayClass1e.<BeginInvokeAction>b__1b(IAsyncResult asyncResult) +241
System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +29
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +111
System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +53
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +19
System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__4(IAsyncResult asyncResult, ProcessRequestState innerState) +51
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +111
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +606
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +288

I found a couple answers on the web and I did the following :

1. Installing Microsoft Access Database Engine 2010 Redistributable
2. Installing 2007 Office System Driver: Data Connectivity Components

I've tried this:

1. From the solution explorer right-click your project then click Properties
2. Click the Build tab
3. Change Platform target from: Any CPU to x86 | Any CPU to x64
4. Re-build your solution

Any suggestions?

Answer 1

It's probably a bitness issue, but it's not about the bitness in your Build properties.

The ACE driver is available in two versions: x86 and x64.

1. You can only install one of them.
2. If you install the x86 version, only x86 applications can use it. If you install the x64 version, only x64 applications can use it. (Yes, it's stupid.)

Now, whether your web application runs in x86 (32-bit) or x64 mode is not determined by your build settings but by the settings of your application pool: Select the application pool in IIS Manager, go to Properties/Advanced Settings and verify the setting of Enable 32-bit Applications. If it is set, your application runs in x86 mode, otherwise in x64 mode. Make sure it is the same mode as the one of which you installed the ACE driver.

(Of course, Steve's answer about using the right driver name also applies.)