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This is now supported in the latest beta. Go to Edit | Preferences > Query and choose "Use Roslyn Daily build". After enabling, go to LINQPad's samples tab and expand the What's new in C# 10 node for a demo.

Let me know how you get along.

The log reports indicate that the Edge Chromium engine (WebView2) wasn't responding. Let me know if the problem persists.

Perhaps it would be best to remove that code completion, given that its actually now redundant:

Dictionary<String,FileInfo> dict = new();    // From C# 9

This should now be fixed in 6.15.1

This issue is reproducible in Results to Data Grids mode.

You can solve this by iterating the IEnumerable manually, to make sure each reader is executed once during execution.

There is a file, but doesn't influence the ordering of connections. The order is always first by connection type, then alphabetically. By renaming a connection (right-click, rename) you will influence the alphabetical ordering. Note that the reordering won't become apparent until you restart LINQPad.

Fair point.

I'll put the ProductVersion into the upcoming 6.14 RTM setup. The auto-updater will start attempting to patch it from 6.15.x.

Sure. In the next build, I'll add a checkbox to achieve that behavior in the connection dialog.

The latest LINQPad 6 beta now has ILSpy 7.1:
https://www.linqpad.net/linqpad6.aspx#beta

Try the latest beta - it has a static Control.UnhandledException event.