devtake.dev — #dotnetArticles tagged dotnet on devtake.dev.https://devtake.dev/en-usC# is getting union types in version 15. The preview shipped in .NET 11 Preview 2.https://devtake.dev/article/csharp-15-union-types-preview/https://devtake.dev/article/csharp-15-union-types-preview/Mads Torgersen's union proposal landed in .NET 11 Preview 2 on April 2. C# 15 targets November 2026 and replaces the OneOf library hack the .NET community has been living with.Sun, 24 May 2026 09:30:00 GMTopen-sourcedotnetcsharplanguage-releasemicrosoftpattern-matchingdev-toolsfsharptypescriptsoren-vanekMicrosoft rushed an out-of-band ASP.NET Core patch. If you shipped between April 14 and April 21, you need to rebuild.https://devtake.dev/article/microsoft-aspnet-emergency-patch/https://devtake.dev/article/microsoft-aspnet-emergency-patch/CVE-2026-40372 lets attackers forge auth cookies on .NET 10.0.6 apps on Linux and macOS. The fix is 10.0.7. Here's what broke, who's exposed, and how to patch.Thu, 23 Apr 2026 09:30:00 GMTsecuritymicrosoftaspnetdotnetcve-2026-40372data-protectionout-of-band-patchsupply-chainluca-reinhardt