In my last post , I talked about how to use Npgsql 2.1.0 and showed an App.config file which you could use as a template for your applications which use Entity Framework 6. Npgsql 2.1.0 didn't have a stable release yet. It is currently in beta (and shortly in RC). You can download it from the following sources: Nuget As already mentioned, Npgsql 2.1.0 didn't have a stable release yet, so you will need to ask Nuget to install a pre-release version of Npgsql. You do that with the following nuget command: PM> Install-Package Npgsql -Pre If you plan to use Entity Framework 6, you will also need to download the Npgsql.EntityFramework assembly. This is done with the following nuget command: PM> Install-Package Npgsql.EntityFramework -Pre If you plan to use Entity Framework 4.x, you will need to download Npgsql.EntityFrameworkLegacy . Install it with the following nuget command: PM> Install-Package Npgsql.EntityFrameworkLegacy -Pre ...