Configure postgres connection string and providerName

connectionstring.xml

<connectionStrings>
  <add name="postgres" providerName="Npgsql" connectionString="Server=127.0.0.1;Port=5432;Database=MyDB;User Id=postgres;Password=postgres;"/>
</connectionStrings>

ConnectionStringFirstAttempt.xml

<connectionStrings>
  <add name="postgres" providerName="???" connectionString="Server=127.0.0.1;Port=5432;Database=MyDB;User Id=postgres;Password=postgres;"/>
</connectionStrings>

machineconfig.xml

<system.data>
	<DbProviderFactories>
		<add name="Microsoft SQL Server Compact Data Provider 4.0" invariant="System.Data.SqlServerCe.4.0" description=".NET Framework Data Provider for Microsoft SQL Server Compact" type="System.Data.SqlServerCe.SqlCeProviderFactory, System.Data.SqlServerCe, Version=4.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91"/>
		<add name="Npgsql Data Provider" invariant="Npgsql" description=".Net Framework Data Provider for PostgreSQL" type="Npgsql.NpgsqlFactory, Npgsql, Version=2.0.12.0, Culture=neutral, PublicKeyToken=5d8b90d52f46fda7"/>
	</DbProviderFactories>
</system.data>

RegistrationsToGAC.txt

"C:\Program Files (x86)\Microsoft SDKs\Windows\v8.0A\bin\NETFX 4.0 Tools\gacutil.exe" -i "C:\Program Files (x86)\PostgreSQL\Npgsql\ms.net4.0\Npgsql.dll"

"C:\Program Files (x86)\Microsoft SDKs\Windows\v8.0A\bin\NETFX 4.0 Tools\gacutil.exe" -i "C:\Program Files (x86)\PostgreSQL\Npgsql\ms.net4.0\Mono.Security.dll"