i use entity framwork with SQL Server CE 3.5 and i have this error
The specified store provider cannot be found in the configuration, or is not valid.
<Schema Namespace="OimDBModel.Store" Alias="Self" Provider="System.Data.SqlServerCe.3.5" ProviderManifestToken="3.5" xmlns:store="http://schemas.microsoft.com/ado/2007/12/edm/EntityStoreSchemaGenerator" xmlns="http://schemas.microsoft.com/ado/2009/02/edm/ssdl">
<EntityContainer Name="OimDBModelStoreContainer">
<EntitySet Name="OfflineMessages" EntityType="OimDBModel.Store.OfflineMessages" store:Type="Tables" />
</EntityContainer>
</Schema></edmx:StorageModels>
Checkout this answer to create a local copy of all the required Sql CE 3.5 assemblies. That should solve your problem
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