C# – Unable to load the native components of SQL Server Compact corresponding to the ADO.NET provider

centity-frameworksql-server-ce

In my project, I use SQL CE 3.5 database with entity framework and followed this article but i have this exception :

Unable to load the native components of SQL Server Compact corresponding to the ADO.NET provider of version 8080. Install the correct version of SQL Server Compact. Refer to KB article 974247 for more details.

All details 

System.Data.SqlServerCe.SqlCeException was unhandled
  Message=Unable to load the native components of SQL Server Compact corresponding to the ADO.NET provider of version 8080. Install the correct version of SQL Server Compact. Refer to KB article 974247 for more details.
  Source=""
  HResult=-1
  NativeError=-1
  StackTrace:
       at System.Data.SqlServerCe.NativeMethods.LoadNativeBinaries()
       at System.Data.SqlServerCe.SqlCeConnection..ctor()
       at System.Data.SqlServerCe.SqlCeProviderFactory.CreateConnection()
       at System.Data.EntityClient.EntityConnection.GetStoreConnection(DbProviderFactory factory)
       at System.Data.EntityClient.EntityConnection.ChangeConnectionString(String newConnectionString)
       at System.Data.Objects.ObjectContext..ctor(String connectionString, String defaultContainerName)
       at DAL.OimDBEntities..ctor()
       at DAL.OimRepository..ctor()
       at Microsoft.Rtc.Collaboration.Sample.SubscribePresenceView.UCMASampleSubscribePresenceView.Subscribe()
       at Microsoft.Rtc.Collaboration.Sample.SubscribePresenceView.UCMASampleSubscribePresenceView.Run()
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException: System.DllNotFoundException
       Message=Unable to load DLL 'sqlceme35.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)
       Source=System.Data.SqlServerCe
       TypeName=""
       StackTrace:
            at System.Data.SqlServerCe.NativeMethods.GetSqlCeVersionInfo(IntPtr& pwszVersion)
            at System.Data.SqlServerCe.NativeMethods.LoadValidLibrary(String modulePath, Int32 moduleVersion)
            at System.Data.SqlServerCe.NativeMethods.LoadNativeBinaries()
       InnerException:

Best Answer

I got this error with a private install of SqlServerCE. I had a reference to System.Data.SqlServerCe.dll in my project, but I was missing other dlls (native components) needed by SqlServerCE. The "native components" are in x86 and amd64 subfolders of SqlServerCE's "private" folder. You need to make sure that they get copied to the output folder of your project.

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