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Develop .Net Database-Independant Application

Hello Experts,

I need to change the Data-Layer of a VB.Net Windows Application that uses SQL Server.
Now the requirement is that it can connect to SqlServer, Postgres, or Oracle.
What will be the best way to handle this change?
I am using VB.Net 2.0, so I can't use LinQ. Besides, I use a lot DataSets with TableAdapters, which have the .Net Data Provider objects (SqlClient) hard-coded.

Any ideas on how is the best way to accomplish an application that can connect to multiple database engines?
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2 Solutions
if you want to connect to multiple database engines, you cannot use sqlclient because that is microsoft specific. You must use oledb stuff.
Take a look at this:

This will solve your problem.

As such the idea can be only be developing a DBLayer
So you will have some common DBLayer which provides certain interfaces. Say like
DataAccesFactory, DataAccess. DataAccess Factory provides the implementation for the specific dataaccess based on which DB to use.

Interface IDataAccess methods can be like
OpenConnection(String Connstr)
DataSet ExecuteQuery(String sqlQuery) //for select
int ExecuteNonQuery(String sqlEuery) //for insert/update or delete

Now implement this in a class like for example SqlDataAccess, similar <myDB>DataAccess ...Implement these as required by the specific database. Now use DataAccessFactory and load the required DBSupport from configuration or pass an enum. like DataAccessFactory.GetDataAccess(SQLDB) on which you get the IDataAccess object implementing the interface above for that DB.

Also you can explore usage of porvider pattern using
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