Browse All .NET Content (350)

Rahul Bhandari (MSFT) and Tara Overfield summarize the April 2026 .NET and .NET Framework servicing releases, including the updated versions, links to release notes and installers, and the list of security CVEs addressed across supported .NET and .NET Framework versions.

.NET Team announces .NET 11 Preview 3, summarizing what’s new across the runtime, SDK, libraries, C#, ASP.NET Core, .NET MAUI, Entity Framework Core, and official container images, with links to detailed release notes and downloads.

Andrew Lock explains how to build and publish custom Docker Sandbox templates so AI-agent sandboxes start with the tooling you need, including an example that installs the .NET SDK and a more advanced approach that swaps the base image while reapplying the sandbox layering.

jordanselig shows how to add runtime governance to a multi-agent ASP.NET Core travel planner on Azure App Service using the Microsoft Agent Governance Toolkit, including YAML policy allowlists, audit logging into Application Insights, and SRE controls like SLOs and circuit breakers.

DevClass.com reports that Microsoft will end support for ASP.NET Core 2.3 on April 7, 2027, leaving it without security patches or fixes and pushing teams running on .NET Framework toward migrating to modern ASP.NET on .NET 10.

Sergey Menshykh explains how Agent Skills in .NET can be authored as file-based skills, inline C# skills, or class-based skills (for example shipped via NuGet), then composed into a single provider. The article also shows script execution and a human-approval gate for tool/script calls in production-style agent scenarios.

Welcome back to this week's roundup. The main thread is that agents are showing up in more places, and teams are getting clearer ways to control how those agents run. Updates across Copilot (IDE, CLI, cloud agent, and mobile) focused on practical autonomy controls, offline/BYOK routing, cross-model review checkpoints, and security remediation loops that end in reviewable pull requests. In parallel, MCP and Azure AI Foundry updates continued to reinforce "run it like software" basics: deployable tool surfaces with real auth, consistent runtimes across cloud and local, and clearer observability and identity boundaries for day-two operations.

Jason Helmick announces that starting with PowerShell 7.7-preview.1, PowerShell will move away from MSI installers on Windows and adopt MSIX as the primary install method, outlining the servicing, reliability, enterprise deployment, and accessibility reasons behind the change.

mosiddi explains how Microsoft’s open-source Agent Governance Toolkit implements production-grade security and reliability controls for autonomous AI agents, covering its package architecture, policy enforcement (Agent OS), zero-trust identity (Agent Mesh), privilege rings (Agent Hypervisor), and SRE/observability integrations, including Azure deployment patterns.

Nick Brady’s March 2026 digest for Microsoft Foundry (Azure AI Foundry) covers major GA releases like Foundry Agent Service, GPT-5.4 family models, evaluations with continuous monitoring into Azure Monitor, private networking, and SDK 2.0 updates across Python, JS/TS, Java, and .NET—plus guardrails and third-party runtime security integrations.

In this Blazor Community Standup video, dotnet (featuring Daniel Roth and Ondřej Roztočil) previews upcoming Blazor validation improvements in .NET 11, including async validation, localized validation messages, and client-side validation without requiring an interactive render mode.

samkemp announces the GA of Foundry Local, a cross-platform on-device AI runtime and SDK that bundles ONNX Runtime and lets developers ship chat and audio inference inside apps with offline operation, hardware acceleration, and OpenAI-format APIs.

jordanselig shows how to instrument Microsoft Agent Framework agents with OpenTelemetry GenAI semantic conventions and send that telemetry to Azure Application Insights, enabling the Agents (Preview) view for per-agent token usage, latency, errors, and end-to-end agent runs across an ASP.NET Core API and a WebJob.

jordanselig walks through building an MCP App (a tool plus a UI resource) with ASP.NET Core, rendering an interactive weather widget inside chat clients like VS Code Copilot, and deploying the MCP server to Azure App Service using azd and Bicep.

Lilian Kasem (she/her) introduces a new Fluent API for building MCP Apps with Azure Functions (.NET isolated worker), showing how to turn an MCP tool into a UI-capable app and configure views, permissions, and CSP security policies with a small amount of code.

Jeffrey Fritz walks through GitHub Copilot’s application modernization assessment report, showing how it drives planning and execution for migrating .NET or Java apps to Azure, including issue triage (cloud readiness, upgrades, security), target compute comparisons (App Service/AKS/Container Apps), and downstream IaC and deployment outputs.

Daniel Roth announces that ASP.NET Core 2.3 reaches end of support on April 7, 2027, explains the practical impact for existing apps, and recommends upgrading to a supported .NET version, including using GitHub Copilot App Modernization to help plan and execute the migration.

Mads Kristensen explains a lesser-known Visual Studio option that controls whether floating tool windows and document windows are owned by the main IDE window, and how setting it to “None” pairs well with PowerToys FancyZones for a cleaner multi-monitor workflow.

Gaurav-Seth describes a hands-on, AI-guided workflow for migrating legacy IIS-hosted ASP.NET Framework apps to Managed Instance on Azure App Service, including how registry, storage, SMTP/MSMQ, and COM dependencies are handled via ARM templates and an install.ps1 startup script.

The dotnet team hosts a community standup showing how to upgrade GenAINET samples to Microsoft Agent Framework (MAF) v1, using GitHub Copilot CLI and SQUAD to coordinate AI agents in a repo and speed up the work, then extending the samples toward production-style hosted-agent scenarios.