The next .net is already go-live. .net 11 rc1, out september 15, compiles string interpolation to…
the next .net is already go-live. .net 11 rc1, out september 15, compiles string interpolation to string.concat and claims go-live support.
the runtime stopped pretending release candidates aren't production.
Context
The .NET Blog post for .NET 11 RC1 is dated September 8th, 2026, and a release-notes listing shows 11.0.0-rc.1 on 2026/09/08. The post says the release candidate comes with a go-live support license for production applications. InfoQ's article of September 15, 2026 says string interpolation now compiles to String.Concat instead of the reflection-based printf engine, making it work with trimming and Native AOT, in its F# section, and the .NET blog lists efficient interpolated strings under F# highlights. The post also lists C# 15 stabilizing unions.
The release is dated September 8 and the September 15 date belongs to the InfoQ article. This is a release candidate with a go-live license and not general availability. The String.Concat change is an F# 11 item and the note does not say F#, and no such claim for C# was found, so it should not be read as a general C# change. Release candidates carrying go-live licenses is a long-running .NET practice that was not researched, and the runtime stopped pretending release candidates aren't production is the author's take.
Watch next
- The .NET 11 general availability date.
Sources
- The .NET Blog: .NET 11 RC 1 (September 8, 2026)devblogs.microsoft.com
- InfoQ: .NET 11 RC1 (September 15, 2026)infoq.com
Provenance
The note above is reproduced unedited from the original post, first published on Threads on 22 September 2026 at 18:36 IST. Sources are the papers and datasets the note draws on.
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