You can obtain the necessary assemblies through these official channels:
For a project strictly targeting , the last fully compatible stable version of Npgsql is v2.2.7 .
: Use the NuGet Package Manager to install version 2.2.7 directly into your project. Use the command: Install-Package Npgsql -Version 2.2.7 . npgsql.dll for .net 4.0 download
To connect a .NET 4.0 application to a PostgreSQL database, you need a specific legacy version of the . Modern versions of Npgsql (5.x and above) require newer frameworks like .NET 6 or .NET Framework 4.6.1+, meaning they are not compatible with the older 4.0 runtime. Determining the Correct Version
: A mirror of legacy versions is also available on SourceForge . Installation and Setup You can obtain the necessary assemblies through these
: You can find older binary releases (zip or msi) on the Npgsql GitHub repository . Look for assets attached to the v2.2.7 release.
Once you have downloaded the Npgsql.dll for .NET 4.0, follow these steps to integrate it into your project: Installing Npgsql.dll for Postgresql - Stack Overflow To connect a
: While Npgsql 4.0 exists, its name can be confusing. Npgsql version 4.x actually targets .NET Framework 4.6.1 and .NET Standard 2.0. It does not support the .NET 4.0 runtime. Where to Download Npgsql.dll for .NET 4.0