Walk-through on the list of the new and enhanced AI features supported in Visual studio 2026 to increase the productivity and rapid development

Visual Studio 2026 Introduces deep GitHub Copilot integration that goes beyond simple code completion. Copilot is now embedded across the entire IDE experience, understanding your project's patterns, architecture, and coding style to provide intelligent, context-aware suggestions.

GitHub Copilot in Visual Studio 2026 is not just a code completion tool—it's an AI pair programmer

Context-Aware Refactoring Suggestions

• Copilot helps refactor code while maintaining your patterns.

• Example: Refactoring to Use Named Query Filters (EF Core 10.0)

• Copilot recognized a repeated filter pattern

Debugging Assistance

Copilot helps during debugging through the Copilot Chat panel, which understands your code context and debugging state.

What is “Did you mean” Code Search?

“Did you mean” is an AI-assisted fuzzy code search feature inside All-in-One Search.

1. Faster navigation in large solutions

2. No need to remember exact method names

3. Reduces context switching

4. Beginner-friendly & productivity-boosting

5. AI-powered symbol discovery

AI Profiler Agent - feature in Visual Studio 2026 Insiders leverages advanced AI capabilities to provide intelligent performance analysis, bottleneck detection, and optimization recommendations for your .NET applications. This feature combines traditional profiling tools with AI-powered insights to help developers identify and resolve performance issues more efficiently.

1. Intelligent Performance Analysis

2. AI-Powered Bottleneck Detection

3. Method-Level Profiling

4. Query Optimization

5. Memory Leak Detection

6. CPU Usage Analysis

Context Menu AI Actions

1. Explain code

2. Optimize logic

3. Generate comments

4. Create unit tests

Eg. Right-click a method → Generate unit tests

Microsoft announced two related updates for Visual Studio: support for bringing your own model (BYOM)

Expands model choice in Chat by letting developers connect API keys from multiple providers.

1. Use OpenAI, Azure OpenAI, Anthropic, Google models

2. Enterprise compliance friendly

3. Plug it directly into Visual Studio

You can install an MCP server directly from the GitHub MCP server registry via Extensions in Visual Studio.

1. From the Visual Studio menu, select Extensions > MCP Regsitries... to open the MCP Server Manager.

2. A practical walk-through to setup Github MCP server

3. Configuring the GitHub MCP server

4. Running the tools from Agent mode from Copilot chat

Understand how to use the prompts and prompt templates predefined in any MCP server you are integrating with Visual studio 2026 Copilot.

It helps rapid prompting to the MCP server , gaining productivity and perfect results.

First-class support for Span<T> and ReadOnlySpan<T> in the language, including new implicit conversion types and consider them in more places, allowing more natural programming with these integral types.

The token field enables you to write a property accessor body without declaring an explicit backing field. The token field is replaced with a compiler synthesized backing field.

The null-conditional member access operators, ?. and ?[], can now be used on the left hand side of an assignment or compound assignment.

The C# 14 feature for No-Operation with benefits if the receiver is null the assignment becomes a safe no-op; if it’s non-null the assignment executes normally

Feature of C# 14 - lets you produce a refactor-safe, compile-time string for the generic type identifier without supplying type arguments or getting runtime backtick text.

Allowing scoped, ref, in, out, ref readonly on lambda parameters without repeating the parameter type.

Before C# 14, you must include the explicit type on a parameter if it has any modifiers, such as ref or out. In C# 14, that restriction is removed

You can now declare instance constructors and events as partial members.

This feature lets you declare an event in one partial type declaration and provide the add/remove implementation in another.

Separates concerns: Signature and implementation (body) can be maintained independently.

Cleaner code

Improves testability

Better organization

Enhancement to the existing extension methods.

Extension members enable you to add properties and operators.

You can also extend types in addition to instances of types.

Asp.Net Core 10 new feature

When using the [FromForm] attribute with a complex object in minimal APIs, empty string values in a form post are now converted to null rather than causing a parse failure.

ASP.NET Core 10 introduces native support for OpenAPI 3.1 document generation.

This is a significant improvement over previous versions where you needed to use third-party packages like Swashbuckle.

Demo on how to generate OpenAPI 3.1 documentation from .NET 10 based API

YAML is a simple, indentation-based format used to define configuration and structured data in a human-friendly way.

It is extremely useful for describing, configuring, and managing APIs

ASP.NET 10 now supports serving the generated OpenAPI document in YAML format.

In ASP.NET Core 10, the `ProducesResponseTypeAttribute` has been enhanced to include an optional `Description` parameter.

This allows developers to provide detailed descriptions for different HTTP response types directly within their API controllers, improving the clarity and usefulness of generated OpenAPI documentation.

Automatically includes XML documentation comments in OpenAPI/Swagger documents.

Enable XML documentation: set <GenerateDocumentationFile>true</GenerateDocumentationFile> in your project file to generate XML docs during build.

The ISO week date system is effectively a leap week calendar system that is part of the ISO 8601 date and time standard issued by the International Organization for Standardization (ISO)

Benefits

Simplified Date Handling: Work with dates without time components

ISO 8601 Compliance: Standard week-based date calculations

Clean API: New overloads specifically for DateOnly type

Type Safety: DateOnly prevents accidental time component usage

Better Performance: No time-related overhead when only dates are needed

Numeric Ordering for String Comparison

Natural Sorting: Numbers in strings are compared numerically, not lexicographically

Human-Friendly Ordering: Matches how humans expect sorted lists (e.g., "file2" before "file10")

Version Sorting: Properly sorts version strings and identifiers with numeric parts

File Name Sorting: Correctly orders file names with numbers (e.g., "image1.jpg", "image2.jpg", "image10.jpg")

Flexible API: Works with StringComparer and CompareOptions for various comparison scenarios

The new float overload of TimeSpan.FromMilliseconds

Creating TimeSpan instances directly from float values

Before .Net 10 - Had to use TimeSpan.FromMilliseconds((double)floatValue)

In .Net 10 - Can directly use TimeSpan.FromMilliseconds(floatValue)

More explicit and type-safe

JsonSerializerOptions.Strict preset includes:

Disallows unmapped JSON members during deserialization

Disallows duplicate JSON properties

Enforces case-sensitive property name matching

Respects nullable annotations

How to configure Using JsonSerializerOptions.Strict preset ?

.NET 10 introduces JsonSerializerOptions.Strict preset

This preset automatically configures strict settings for enhanced data integrity

The AllowDuplicateProperties option in JsonSerializerOptions controls whether duplicate property names are allowed during JSON deserialization.

Prevents silent data corruption - Stops duplicate properties from silently overwriting values, which can cause incorrect data.

Improves data validation - Fails fast on malformed JSON, making issues visible during deserialization.

Enhances security - Reduces risk from malicious or malformed JSON that could exploit duplicate handling.

Standards compliance - Aligns with stricter JSON validation requirements and helps catch errors early in the pipeline.

JsonSerializerOptions - Unmapped Member Handling (Disallow Unmapped Members)

How to perform Unmapped Member Handling?

Using JsonSerializerOptions.Strict we can handle it.

Will raise JsonException and Unmapped properties are now rejected.

Default behavior is to allow unmapped properties.

In earlier versions unmapped properties were silently ignored.

JsonSerializerOptions - Case-Sensitive Property Matching

Case-Sensitive property matching during Json serialization.

Benefits

Early detection of API contract violations

Guarantees exact field name matching

Fails fast on schema violations

Stricter validation prevents injection attacks

JsonSerializerOptions - Respects nullable annotations

How can we handle nullable properties?

Missing nullable properties handling while deserialization

Respect Required Constructor Parameters

Enforces immutability and complete object construction

Ensures API contract compliance

Leverages compile-time type safety

This is especially valuable in systems where data integrity, security, and compliance are critical, such as financial systems, healthcare applications, and enterprise software with strict validation requirements.

Previously, deserializing from a PipeReader required converting it to a stream, but the new overloads eliminate that step by integrating PipeReader directly into the serializer

PipeReader reads data incrementally, so you don't need to load the entire JSON payload into memory. Useful for large JSON files or network streams where the full size isn't known upfront.

Reduces allocations and improves performance compared to converting bytes to a string or using a MemoryStream.

Real-time JSON processing pipelines

AOT stands for Ahead-of-Time compilation. It’s a .NET compilation model that differs from the traditional JIT (Just-In-Time) approach

Your code compiles directly to native machine code at build time

The old ValidationContext constructors used reflection or implicit parameters

Native AOT can’t use reflection reliably, so those constructors fail

The new AOT-safe constructor explicitly accepts all parameters (no reflection needed)

This enables validation to work in native AOT scenarios

The key improvements made to System.IO.Compression.ZipArchive in .NET 10

Optimized entry writing in Update mode - reduces memory by avoiding loading all entries

Parallelized extraction for better performance with large archives

Optimized internal data structures for reduced memory footprint

New asynchronous APIs for non-blocking operations

Scalability: Better handling of large ZIP archives

Learn how to create

1. DBContext file

2. Setting up relationship between entities

3. Creating the database migration file in VS 2026

4. Applying the migrations to create schema in SQL server

Support for .NET 10 LeftJoin and RightJoin Operators

EF Core 10.0 adds support for the new .NET 10 `LeftJoin` and `RightJoin` LINQ operators, simplifying left and right outer joins in your queries.

Previously, implementing a `LEFT JOIN` or `RIGHT JOIN` in LINQ required a combination of `SelectMany`, `GroupJoin`, and `DefaultIfEmpty` methods, which could be complex and less readable. With the introduction of these operators in .NET 10, such queries become more straightforward and maintainable.

EF Core 10.0 allows you to specify custom names for default constraints, rather than letting the database generate them automatically.

Previously, default constraints were auto-generated by the database. Now you can:

Name individual default constraints

Enable automatic naming for all default constraints

Benefits

Consistent naming conventions

Easier to identify constraints in database scripts

Better database documentation

Easier to reference constraints in stored procedures or scripts

EF 10 also fully supports the new JSON data type, also available on Azure SQL Database and on SQL Server 2025

While SQL Server has included JSON functionality for several versions, the data itself was stored in plain textual columns in the database; the new data type provides significant efficiency improvements and a safer way to store and interact with JSON.

When using `UseAzureSql()` or compatibility level 170+, EF automatically uses the new JSON data type for:

- Primitive collections (arrays)

- Complex types mapped to JSON

EF Core 10 - Vector search support

Vector Search in SQL Server enables semantic similarity searches using the native vector data type and VECTOR_DISTANCE() function.

It stores embeddings (numerical representations of meaning) and finds data by conceptual similarity rather than exact keyword matches.

AI-Powered Applications: Enables semantic search, recommendation systems, and RAG (Retrieval-Augmented Generation) directly in the database.

Native Vector Data Type: SQL Server 2025 and Azure SQL Database support the vector data type for storing embeddings (e.g., 1536-dimensional vectors for text).

This lecture will provide the information about

1. Setting up the table schema with vector data type supported in SQL server 2025

2. How to setup the DB context for the table entity with the vector data type column with EF.

3. A mock embedding generator for the sample data.

Learn how to code the vector search support with VECTOR_DISTANCE() function of EF Core

1. A sample code explanation for finding similar products from database using conceptual similarity

2. Finding the similar products by score using the distance of embeddings.

SSE as a lightweight, HTTP-native technology for server-to-client push notifications, contrasting it with WebSockets and SignalR for unidirectional real-time updates.

ASP.NET Core now supports returning a ServerSentEvents result using the TypedResults.ServerSentEvents API. This feature is supported in both Minimal APIs and controller-based apps.

Server-Sent Events (SSE) let a server push text updates to a browser over a single HTTP connection. In contrast to WebSockets, SSE is unidirectional: the browser receives events from the server, and the client can still send normal HTTP requests if it needs to.

Live Demo , Use cases , and Benefits of using SSE