Unlisted C++ runtime/SDK dependency

[swdev78]

Apologies if the dependency was mentioned and I didn't see it

If the C++ runtime (or SDK) is missing on a user's machine they will get the following exception when connecting to DataBento:

System.DllNotFoundException: Unable to load DLL 'databento_native' or one of its dependencies: The specified module could not be found. (0x8007007E)

I am a C++ dev so I always have the SDK installed, but my coworker is a C# dev and did not. He got that exception until he installed the C++ dependencies.

An easy way to add them is to do a Visual Studio Repair and add the following to the install:

After doing the install/repair he stopped getting the exception.

[Alparse]

Thanks for reporting this! You're absolutely right - this was a critical issue that blocked users without Visual Studio from using the library.

✅ Fixed in v3.0.23-beta 🎉

The NuGet package now includes the required Visual C++ Runtime DLLs:

• MSVCP140.dll
• VCRUNTIME140.dll
• VCRUNTIME140_1.dll

No user action required - just update to the latest version:

dotnet add package Databento.Client --prerelease

What Changed

The library now bundles Microsoft's Visual C++ 2015-2022 redistributable DLLs directly in the NuGet package. This is the standard approach for .NET libraries with native dependencies (similar to Microsoft.Data.SqlClient, SkiaSharp, etc.).

For Existing Users

If you already installed the VC++ redistributable (via Visual Studio or the standalone installer), that's fine - Windows will use the bundled versions from the package, and everything will continue to work.

Verification

Tested on:

• ✅ Fresh Windows installation without any VC++ runtime
• ✅ .NET 8.0 projects
• ✅ .NET 9.0 projects
• ✅ No DllNotFoundException errors

Troubleshooting

In rare cases on minimal/locked-down Windows installations, you may still need to install the full VC++ Redistributable, but this should be unnecessary for 99% of users.

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Thanks again for the detailed report - the error description was very helpful! 🙏

Release Notes: https://github.com/Alparse/databento-dotnet/releases/tag/v3.0.23-beta
NuGet Package: https://www.nuget.org/packages/Databento.Client/3.0.23-beta (may take 5-15 minutes to appear)