Can't open multiple solution from the same folder.

[jburman]

Describe the Issue

I have been unable to successfully open more than one .slnx file that are stored in the same folder.

1. Opening a second instance of VS Code and opening the folder with the solutions does not prompt for which solution to open and simply brings up the existing VS Code instance that has a different solution open from the folder.
2. I tried creating a second profile and open the folder with that, but it does the same as above.
3. I tried moving one of the .slnx to a sub folder and C# dev kit does not seem to recognize the solution file (I tested it with regular VS and no issues).

Is there some secret?

Steps To Reproduce

No response

Expected Behavior

When opening the folder with a new instance of VS Code I'd expect to be prompted for which solution to open. Also would be nice to have C# dev kit add a tab with recent solutions to pick from.

Environment Information

No response

[claudiaregio]

@jburman Could you please share the versions of VS Code, C# Dev Kit, and the C# extension you are working with? Is it correct that you are trying to work on 2 solutions at the same time in the same VS Code instance? If so, we are experimenting with an experience in the pre-release versions of our extensions aimed at enabling this scenario. If you'd like to try it out, follow the instructions here to install them: https://github.com/microsoft/vscode-dotnettools/wiki/Installing-and-updating-pre%E2%80%90release-versions-of-C%23-Dev-Kit-and-C%23-Extension

Then just open your folder with all the solutions in it and let us know how things work!

[jburman]

Here is the VS Code Version:

Version: 1.103.2 (system setup)
Commit: 6f17636121051a53c88d3e605c491d22af2ba755
Date: 2025-08-20T16:45:34.255Z
Electron: 37.2.3
ElectronBuildId: 12035395
Chromium: 138.0.7204.100
Node.js: 22.17.0
V8: 13.8.500258-electron.0
OS: Windows_NT x64 10.0.26100

C# Dev Kit: 1.41.11
C# Extension: 2.87.31

Ok I also installed the Insider version and have the extension versions:
C# Dev Kit: 1.50.33
C# Extension: 2.90.51

The first time I opened the folder, it did not prompt for a solution but appeared to auto-generate a temporary solution, which included projects from sub-folders.
I closed the temp solution and then opened one of my solutions and that worked.
Then I opened a new instance of VS Code Insiders and tried to open the folder again, but it again brought the first window back up and didn't let me pick a different solution. So, except for the first part where it created a temporary solution, the behavior seems the same to me as non-insiders.

Thanks,
Jeremy

[claudiaregio]

@jburman would you be able to provide a screen recording of what you're trying to do and the issue? We are unable to follow the ask with the written portion.