ASP.NET: How to support two database types in one application? (Access, MS SQL Server 2008 Express)?

Yes, from framework 2.0 all data readers inherit from the DbDataReader class, so your methods could take a DbDataReader isntead of an OleDbDataReader and you could use the methods with any database.

The link you're likely missing is the functionality of the DbProviderFactories class. Using this class (and associated helpers also in System.Data. Common), you can abstract the provider and use references to the base classes (such as DbConnection and DbCommand) to do the work.

It'd look something like this.

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