Answer / madduri

SQLServer.NET data provider is high-speed and robust, but
requires SQL Server license purchased from Microsoft.
OLE-DB.NET is universal for accessing other sources, like
Oracle, DB2, Microsoft Access and Informix, but it?s a .NET
layer on top of OLE layer, so not the fastest thing in the
world. ODBC.NET is a deprecated layer provided for backward
compatibility to ODBC engines.

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