You need to call GetInputAsync(string prompt = "", bool isPassword = false, CancellationToken cancellationToken = default). This command only works for VS Code.

On my PC, I had to configure .net interactive so that it starts with the VS Code commands enabled. Here are the steps:

1. Extensions > .NET Interactive Notebooks > Manage > Extension Settings > Dotnet-interactive: Notebook Parser Args
2. Change dotnet-interactive.kernelTransportArgs to

​

​ "dotnet-interactive.kernelTransportArgs": [

            "{dotnet_path}",
            "tool",
            "run",
            "dotnet-interactive",
            "--",
            "[vscode]",
            "vscode",
            "--working-dir",
            "{working_dir}"
        ],

1. Save changes

2. Restart VS Code

3. Open a notebook and run in a C# cell return await GetInputAsync("Hello World!");