[dotnet-maestro]

Note

This is a codeflow update. It may contain both source code changes from
the VMR
as well as dependency updates. Learn more here.

This pull request brings the following source code changes

From https://github.com/dotnet/dotnet

• Subscription: 81d064a4-929c-4152-b746-ee3acc24b4ed
• Build: 20261016.1 (336905)
• Date Produced: October 16, 2026 11:28:09 AM UTC
• Commit: be06e8febe57db1ea30be9f0863133a892c01645
• Commit Diff: 420d9a5...be06e8f
• Branch: main

Updated Dependencies

• From 12.0.0-beta.26513.107 to 12.0.0-beta.26516.101
  • Microsoft.DotNet.Arcade.Sdk
  • Microsoft.DotNet.Build.Tasks.Templating
  • Microsoft.DotNet.CMake.Sdk
  • Microsoft.DotNet.GenFacades
  • Microsoft.DotNet.Helix.Sdk
  • Microsoft.DotNet.RemoteExecutor
  • Microsoft.DotNet.XUnitV3Extensions
• From 12.0.0-alpha.1.26513.107 to 12.0.0-alpha.1.26516.101
  • Microsoft.NET.Sdk.IL
  • Microsoft.NETCore.App.Ref
  • Microsoft.NETCore.ILAsm
  • Microsoft.NETCore.ILDAsm
  • Microsoft.Win32.SystemEvents
  • runtime.win-x64.Microsoft.NETCore.ILAsm
  • runtime.win-x86.Microsoft.NETCore.ILAsm
  • System.CodeDom
  • System.Configuration.ConfigurationManager
  • System.Diagnostics.DiagnosticSource
  • System.Formats.Nrbf
  • System.IO.Hashing
  • System.Reflection.MetadataLoadContext
  • System.Resources.Extensions
  • System.Runtime.Serialization.Formatters
  • System.Text.Encodings.Web
  • System.Text.Json
  • System.Windows.Extensions

Microsoft Reviewers: Open in CodeFlow

Associated changes in source repos

• dotnet/arcade@5a63d05...7dad901
• dotnet/msbuild@74878b5...c1c99ee
• NuGet/NuGet.Client@fa1508b...6279805
• dotnet/runtime@0d73c1f...00cc051
• dotnet/source-build-assets@0515390...6d519fc
• microsoft/vstest@05cd781...8ed19ef

Diff the source with this PR branch

darc vmr diff --name-only https://github.com/dotnet/dotnet:be06e8febe57db1ea30be9f0863133a892c01645..https://github.com/dotnet/winforms:darc-main-b0552af0-1593-4ba8-884a-8fc99c2a7f48

[dotnet-maestro]

Note

Other PRs in the commit range

• [main] Source code updates from dotnet/source-build-assets dotnet#10146
• [main] Source code updates from nuget/nuget.client dotnet#10093

💡 You may consult the FAQ for more information or tag @dotnet/prodconsvcs for assistance.

[dotnet-policy-service]

Go, you big red fire engine!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 37.84861%. Comparing base (c4891de) to head (b41bac2).

Additional details and impacted files

@@              Coverage Diff              @@
##                main      #15279   +/-   ##
=============================================
  Coverage   37.84861%   37.84861%           
=============================================
  Files            246         246           
  Lines           9789        9789           
  Branches        1031        1031           
=============================================
  Hits            3705        3705           
  Misses          5920        5920           
  Partials         164         164           

Flag	Coverage Δ
Debug	37.84861% <ø> (ø)
production	40.04608% <ø> (ø)
test	20.64923% <ø> (ø)
unit	40.04608% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[dotnet-maestro]

Note

Other PRs in the commit range

• [main] Source code updates from dotnet/arcade dotnet#10199
• [main] Source code updates from dotnet/msbuild dotnet#10120
• [main] Source code updates from nuget/nuget.client dotnet#10201
• [wasm][debugger] Escape values in expression evaluation scripts dotnet#10217
• Use servicing XL pools for release branch builds dotnet#10191
• [main] Source code updates from dotnet/runtime dotnet#10153
• Keep non-shipping Mono packages prerelease dotnet#10230
• Discard abandoned SSR output when a component redirects mid-render dotnet#10221
• Fix Core Identity email lookup dotnet#10222
• Avoid rescanning in FormPipeReader when form data arrives incrementally dotnet#10219
• Stop the HTTP/1 request loop when the connection is aborted dotnet#10225
• Make FileBufferingReadStream lazily rent buffer dotnet#10220
• Harden Negotiate LDAP role and identity validation dotnet#10226
• Port .NET 11 Blazor component fix dotnet#10240
• Reject non-predefined cultures in request localization fallback dotnet#10224
• [wasm] Encode exception text on debug page dotnet#10223
• Fix MessageBuffer.ResendAsync and send-side FIN DoS dotnet#10241
• [main] Source code updates from microsoft/vstest dotnet#10200

💡 You may consult the FAQ for more information or tag @dotnet/prodconsvcs for assistance.

[Shyam-Gupta]

@copilot fix the build issue.

[Copilot]

@copilot fix the build issue.

The PR check shows failures across the Windows build matrix, but those jobs link to Azure DevOps; the GitHub job-log endpoint returns 404 for them. A local Arcade build is also blocked during package restore by a network/DNS failure, so I don’t yet have the first failing build error needed to make a targeted fix. Could you share the relevant Azure log excerpt or error?

[Shyam-Gupta]

@copilot I see this error in the build logs:
D:\a_work\1\s\src\Microsoft.VisualBasic.Forms\tests\UnitTests\System\Windows\TestUtilities\VbFileCleanupTestBase.vb(76,24): error BC30002: Type 'Security.SecurityException' is not defined. [D:\a_work\1\s\src\Microsoft.VisualBasic.Forms\tests\UnitTests\Microsoft.VisualBasic.Forms.Tests.vbproj]
##[error]src\Microsoft.VisualBasic.Forms\tests\UnitTests\System\Windows\TestUtilities\VbFileCleanupTestBase.vb(76,24): error BC30002: Type 'Security.SecurityException' is not defined.

[Copilot]

@copilot I see this error in the build logs:
D:\a_work\1\s\src\Microsoft.VisualBasic.Forms\tests\UnitTests\System\Windows\TestUtilities\VbFileCleanupTestBase.vb(76,24): error BC30002: Type 'Security...

Fixed the compile error by fully qualifying the caught type as System.Security.SecurityException. Commit: b41bac2. The targeted build could not complete because restoring the Arcade SDK package failed due to network access, but the final diff review found no issues.