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ing Data Providers Using Interfaces At this point, you should have a better idea of the common functionality found among all .NET data providers, based on the core interfaces you just examined. Recall that even though the exact names of the implementing types will differ among data providers, you are able to program against these types in a similar manner—that’s the beauty of interface-based polymorphism. Therefore, if you define a method that takes an IDbConnection parameter, you can pass in any ADO.NET connection object: Public Sub OpenConnection(ByVal cn As IDbConnection) ' Open the incoming connection for the caller. cn.Open() End Sub The same holds true for a member return value. For example, consider the following example VB 2005 program, which allows the caller to obtain a specific connection object using the value of a custom enumeration and a custom function named GetConnection(): Enum DataProvider SqlServer OleDb Odbc Oracle End Enum Module Program Sub Main() ' Get a specific connection via GetConnection() helper function. Dim myCn As IDbConnection = GetConnection(DataProvider.SqlServer) ' Assume we wish to connect to the SQL Server Pubs database. myCn.ConnectionString = _ "Data Source=localhost;uid=sa;pwd=;Initial Catalog=Pubs" ' Now open connection via our other helper function. OpenConnection(myCn) ' Use connection and close when finished. ... myCn.Close() End Sub Function GetConnection(ByVal dp As DataProvider) As IDbConnection Dim conn As IDbConnection = Nothing Select dp Case DataProvider.SqlServer conn = New SqlConnection() Exit Select Case DataProvider.OleDb conn = New OleDbConnection() Exit Select Case DataProvider.Odbc 5785ch24.qxd 3/31/06 11:32 AM Page 776

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