VB.NET App Crashes After Installation Due to SQLite DllNotFoundException

Application Startup Failure with SQLite DllNotFoundException and Kernelbase.dll Exception

Issue Overview: SQLite Dependency Resolution in Deployed VB.NET Applications

The problem involves a VB.NET WinForms application developed in Visual Studio 2023 that functions correctly in debug and release modes but crashes immediately after installation. The crash manifests as a brief spinner animation followed by termination, with no user-facing error messages. Event logs reveal two critical errors:

1. System.DllNotFoundException for sqlite3_config_none in KERNELBASE.dll.
2. An unhandled exception chain starting at SQLiteConnection instantiation, propagating to InvalidOperationException during form initialization.

The application relies on SQLite for data storage, with the database located at C:\{custom_directory}\database.sqlite. The installer deploys the app to C:\Program Files\WindowsApps\{package_id}, a restricted Windows AppX package directory. The crash occurs due to a failure to load SQLite’s native interop library (SQLite.Interop.dll), which is not correctly deployed or resolved at runtime. This issue is exacerbated by Windows AppX sandboxing, which restricts file system access and dependency resolution.

Key technical details:

• Exception Code 0xe0434352: Indicates a .NET runtime exception.
• Faulting Module KERNELBASE.dll: A Windows system DLL responsible for low-level operations, often involved in exception handling.
• Missing Dependency Chain: The System.Data.SQLite.dll wrapper attempts to call sqlite3_config_none (a SQLite configuration function) but cannot locate the native SQLite.Interop.dll.
• Deployment Context: The application is packaged as a Windows Store-compatible AppX, subject to strict file system permissions and dependency isolation rules.

Root Causes: SQLite Deployment Misconfiguration and Runtime Environment Constraints

The crash stems from a combination of SQLite deployment oversights and Windows AppX sandboxing limitations. Below are the primary causes:

1. Incorrect SQLite Binary Deployment
   The System.Data.SQLite NuGet package or manually referenced assemblies may not include platform-specific SQLite.Interop.dll files in the required directory structure. For SQLite to function:

   • System.Data.SQLite.dll must reside in the application’s root directory.
   • SQLite.Interop.dll must be placed in x86 (32-bit) or x64 (64-bit) subdirectories relative to the executable.
     If these files are missing or placed incorrectly, the .NET runtime cannot load the native SQLite library, triggering the DllNotFoundException.

2. Architecture Mismatch Between Application and SQLite Binaries
   The application is compiled for "Any CPU" but deployed with SQLite binaries for only one architecture (e.g., 32-bit). When running on a 64-bit OS, the .NET runtime may default to 64-bit mode, causing a mismatch with 32-bit SQLite.Interop.dll. Conversely, AppX packages enforce strict architecture alignment, and mixed deployments are unsupported.

3. Windows AppX Sandboxing and File System Restrictions
   Applications installed via the Microsoft Store or AppX packages run in a sandboxed environment with limited access to the file system. Key issues:

   • The database path C:\{custom_directory} is inaccessible due to AppX write restrictions.
   • The WindowsApps directory prohibits modifications, preventing self-repair (e.g., extracting missing DLLs).
   • Dependency probing for SQLite.Interop.dll fails because the runtime cannot traverse directories outside the package’s virtualized file system.

4. Missing Microsoft Visual C++ Redistributable
   SQLite’s native components depend on the Visual C++ runtime (e.g., vcruntime140.dll). If omitted during deployment, the OS cannot resolve secondary dependencies, leading to silent failures.

Resolution: Fixing SQLite Deployment and Bypassing AppX Limitations

Step 1: Validate and Correct SQLite Binary Placement

1. Retrieve Correct Binaries
   Download the official System.Data.SQLite binaries from sqlite.org. Use the Precompiled Binaries for .NET 4.6 (e.g., sqlite-netFx46-binary-x64-2015-1.0.118.0.zip).

   • Avoid NuGet for deployment-critical scenarios; manually reference binaries to ensure control over file placement.

2. Reorganize Project Directories
   Add the following structure to your VB.NET project:

   Project/
   ├─ bin/
   │  ├─ Release/
   │  │  ├─ x86/
   │  │  │  └─ SQLite.Interop.dll  
   │  │  ├─ x64/
   │  │  │  └─ SQLite.Interop.dll  
   │  │  └─ System.Data.SQLite.dll  
   

   Ensure the build action for SQLite.Interop.dll is set to Content with Copy to Output Directory = Always.

3. Update Project References
   Remove NuGet-based SQLite references. Manually add a reference to System.Data.SQLite.dll via Add Reference > Browse.

Step 2: Enforce Architecture Consistency

1. Set Explicit Build Targets
   In Project Properties > Compile > Advanced Compile Options, set Target CPU to x86 or x64 (not "Any CPU"). This ensures the application matches the architecture of deployed SQLite binaries.

2. Modify Installer Settings
   In the Visual Studio Installer project, specify the same architecture (x86/x64) as the SQLite binaries. Mixed architectures in AppX packages are invalid.

Step 3: Adapt Database Path for AppX Sandboxing

1. Relocate the Database
   Avoid hardcoding paths like C:\. Use Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData) to resolve to C:\ProgramData\{AppName}\database.sqlite, which is writable in most contexts.

2. Handle First-Run Initialization
   Add startup code to copy the database from the installation directory to ProgramData if it doesn’t exist:

   Dim appDataPath As String = Path.Combine(
       Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData),
       "MailLabels"
   )
   If Not Directory.Exists(appDataPath) Then
       Directory.CreateDirectory(appDataPath)
   End If
   Dim dbDest As String = Path.Combine(appDataPath, "database.sqlite")
   If Not File.Exists(dbDest) Then
       File.Copy("C:\SqliteDb\database.sqlite", dbDest)
   End If
   

Step 4: Diagnose Dependency Loading with Process Monitor

1. Capture File System Activity
   Use Process Monitor to trace file access attempts during startup:

   • Launch ProcMon.
   • Add filters: Process Name = MailLabels.exe, Result = NAME NOT FOUND.
   • Identify missing files (e.g., SQLite.Interop.dll, vcruntime140.dll).

2. Resolve Missing Dependencies

   • If vcruntime140.dll is missing, bundle the Visual C++ Redistributable with your installer.
   • Ensure SQLite.Interop.dll is in x86 or x64 subdirectories relative to the executable.

Step 5: Simplify Deployment with Traditional Installers

1. Avoid AppX for Non-Store Deployments
   Use InnoSetup or Advanced Installer to create a standard MSI/EXE installer. These tools:

   • Correctly bundle dependencies.
   • Install to Program Files without sandboxing.
   • Allow desktop shortcuts and registry entries.

2. Test Deployment Locally
   Copy the bin\Release directory to a test machine (without Visual Studio). Verify:

   • The application launches.
   • The database is accessible at ProgramData\{AppName}.

Step 6: Prepare for Microsoft Store Submission

1. Convert to MSIX Packaging
   Use the MSIX Packaging Tool to repackage your application. MSIX:

   • Supports dependency declaration (include SQLite.Interop.dll as content).
   • Allows file system access via declared capabilities in Package.appxmanifest:

     <Capabilities>
       <rescap:Capability Name="broadFileSystemAccess" />
     </Capabilities>
     

2. Test in Windows Sandbox
   Validate the MSIX package in an isolated environment to detect permission issues early.

By addressing SQLite’s deployment mechanics, aligning architectures, and adapting to Windows AppX constraints, the application will reliably start post-installation. For further refinement, integrate logging to capture runtime errors and validate database connectivity before initializing forms.