Install the .NET Interactive Notebooks extension from the marketplace.
Opening and Creating notebooks
To open an existing .NET notebook, bring up the Command Palette(Ctrl+Shift+P) and select .NET Interactive: Open notebook. Now, navigate to a local .ipynb file.
To create a new notebook, open the Command Palette(Ctrl+Shift+P), and select .NET Interactive: Create new blank notebook. You can also create a new notebook with Ctrl+Shift+Alt+N key combination.
The .NET Interactive extension for VS Code uses the dotnet-interactive tool which collects usage and sends telemetry to Microsoft to help us improve our products and services. Read our privacy statement to learn more. See here to learn more about telemetry in .NET Interactive.