.NET Support Lifecycle & Release History

.NET Lifecycle & End of Life (EOL) Policy

The .NET support policy follows Microsoft's Modern Lifecycle, covering the runtime, SDK, ASP.NET Core, and Entity Framework Core. It starts from general availability and ends at EOL, with support requiring users to stay current on patches for eligibility.

Releases are categorized as LTS or STS, with even-numbered major versions being LTS and odd ones STS. All releases maintain high quality, but differ in support length to suit different needs like stability or quick innovation.

During active support, updates bring new features, bug fixes, performance boosts, and security patches, plus compatibility with evolving OS and hardware. The final six months shift to maintenance, focusing only on security fixes.

Patches come out monthly on Patch Tuesday, cumulative and announced via blogs and GitHub. This setup helps teams plan upgrades and keep systems secure without unexpected breaks.

Understanding this policy aids in aligning development with reliable timelines, reducing risks and supporting smooth operations in diverse environments.

LTS vs STS -- Impact on Support Duration

LTS versions offer three years of support, ideal for applications needing long-term stability without frequent changes. This longer window allows thorough testing and deployment in large setups.

STS versions provide two years, targeting users who prioritize latest features but accept more regular upgrades. Previously called Current, STS fits dynamic projects.

The duration impacts upgrade planning, resource allocation, and compliance. LTS minimizes disruption, while STS accelerates adoption of improvements.

Both follow identical update models, ensuring consistency. Choosing depends on project scale and pace, balancing reliability with advancement.

Risks of Using End-of-Life (EOL) Versions

Running EOL .NET versions exposes systems to unpatched vulnerabilities, heightening cyber attack risks and potential data breaches.

Compatibility with new tech may falter, leading to performance drops or failures. Without assistance, fixing issues becomes time-consuming.

Regulatory violations could arise, inviting penalties in strict industries. Overall, it strains resources and threatens operational integrity.

Proactive migration avoids these pitfalls, enhancing security and efficiency.

Key Risks

• Unaddressed security holes.
• Hardware/OS incompatibility.
• Compliance failures.
• Increased downtime costs.

What Happens After .NET Reaches EOL

Post-EOL, no updates, fixes, or help from Microsoft. Apps may run but lack protection against new threats.

Users should upgrade, uninstall unused versions, or apply final patches while planning transitions.

This phase encourages modernization, improving app capabilities.

Tracking & Monitoring .NET EOL Dates

Monitor via supported versions tables showing phases and end dates. Follow monthly patch announcements on blogs and GitHub.

EOL aligns with Patch Tuesday for predictability. Set alerts for seamless planning.

Monitoring Tips

• Check version lists regularly.
• Subscribe to update notifications.
• Calendar EOL milestones.

How To Check Your .NET Version

Use CLI for quick checks across platforms.

dotnet --list-sdks

Lists SDK versions and paths.

dotnet --list-runtimes

Shows runtime details.

dotnet --info

Provides comprehensive info including OS.

If commands fail, inspect install folders:
Windows: C:\Program Files\dotnet;
Linux/macOS: /usr/share/dotnet or similar.