The data provider is not displayed in the list on the Provider tab in the ADO Connection Editor because it's not actually installed on the machine. You copy a set of files into your project directory and add project references for any that are dll's. One of them is npgsql.dll, the .NET data provider. Npgsql.dll is a library with different classes you invoke to access the database. I can't embed SQL but I can still access the database.
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