Why Can't I Load SQLite.Interop.dll in VS2010, and How Do I Fix It?

Resolving the 'SQLite.Interop.dll' Loading Failure in Visual Studio 2010

A recurring problem for Visual Studio 2010 users involves the failure to load the 'SQLite.Interop.dll' file, resulting in the following error:

Error Message:

Unable to load DLL 'SQLite.Interop.dll': The specified module could not be found. (Exception from HRESULT: 0x8007007E)

Scenario:

This error typically manifests on 64-bit Windows 7 systems using Visual Studio 2010 and SQLite version 1.0.82.0 (installed via NuGet). The error persists across debug and release builds, both inside and outside the Visual Studio environment. A temporary fix involves restarting the system, but the problem often returns.

Underlying Issue and Solution:

The root cause is an inconsistency in how the DLL is loaded. Specifically, SQLite's method of selecting the correct 'Interop' DLL version depends on the entry assembly. To resolve this, the SQLite NuGet package must be included in both the project containing the DLL and the main application project, even if the main project doesn't directly use SQLite classes. This ensures consistent DLL loading and prevents the error.

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