Why Can't I Load 'SQLite.Interop.dll' and How Do I Fix It?

Resolving the Persistent "Unable to Load DLL 'SQLite.Interop.dll'" Error

Many developers encounter the persistent error "Unable to load DLL 'SQLite.Interop.dll'" when working with the SQLite.Interop module. This problem has been reported with version 1.0.82.0, particularly when installed via NuGet within Visual Studio 2010 on 64-bit Windows 7 systems.

This error consistently appears in both debug and release builds, regardless of whether the application runs within or outside Visual Studio. A temporary fix involves logging off and back on, but this is clearly not a sustainable solution.

The Solution: A NuGet Package Dependency

Recent findings indicate the root cause often lies in the NuGet package installation process. The key is to ensure the package is installed not only in the project containing the DLL, but also in the main website project, even if the website project doesn't directly use SQLite classes.

This is because SQLite.Interop uses the entry assembly to identify the correct Interop module version. Installing the package in both projects guarantees the consistent loading of the appropriate DLL version.

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