Here’s the list of what’s new in this preview:

• Razor Components renamed back to server-side Blazor
• Client-side Blazor on WebAssembly now in official preview
• Resolve components based on @using
• _Imports.razor
• New component item template
• Reconnection to the same server
• Stateful reconnection after prerendering
• Render stateful interactive components from Razor pages and views
• Detect when the app is prerendering
• Configure the SignalR client for server-side Blazor apps
• Improved SignalR reconnect features
• Configure SignalR client for server-side Blazor apps
• Additional options for MVC service registration
• Endpoint routing updates
• New template for gRPC
• Design-time build for gRPC
• New Worker SDK 

Here’s a summary of what’s new in this preview release:

• Improved ASP.NET Core debugging experience
• Servers & middleware
  • IHttpSysRequestTimingFeature
  • SNI hostname in ITlsHandshakeFeature
  • IExceptionHandler
• Blazor
  • New Blazor Web App project template
  • Blazor router integration with endpoint routing
  • Enable interactivity for individual components with Blazor Server
  • Improved packaging of Webcil files
  • Blazor Content Security Policy (CSP) compatibility
• API authoring
  • Support for generic attributes
• SignalR
  • SignalR seamless reconnect
• Native AOT
  • Support for AsParameters and automatic metadata generation in compile-timed generated minimal APIs
• Authentication and authorization
  • Authentication updates in ASP.NET Core SPA templates
  • New analyzer for recommended AuthorizationBuilder usage
   

Here’s what’s new in this release for ASP.NET Core:

• New component tag helper
• Prevent default actions for events in Blazor apps
• Stop event propagation in Blazor apps
• Validation of nested models in Blazor forms
• Detailed errors during Blazor app development 

Here’s a summary of what’s new in this preview release:

• Improved startup debugging experience
• Blazor
  • Form model binding & validation with server-side rendering
  • Enhanced page navigation & form handling
  • Preserve existing DOM elements with streaming rendering
  • Specify component render mode at the call site
  • Interactive rendering with Blazor WebAssembly
  • Sections improvements
  • Cascade query string values to Blazor components
  • Blazor Web App template option for enabling server interactivity
  • Blazor template consolidation
• Metrics
  • Testing metrics in ASP.NET Core apps
  • New, improved, and renamed counters
• API authoring
  • Complex form binding support in minimal APIs
• Servers & middleware
  • HTTP.sys kernel response buffering
  • Redis-based output-cache
   

What's new for the Microsoft Fluent UI Blazor components version 3.1.0 

WHAT IS BLAZOR?

Blazor is a single-page app framework for building interactive client-side Web apps with .NET. Blazor uses open web standards without plugins or code transpilation. Blazor works in all modern web browsers, including mobile browsers. 

fericode/Blazor.PersianDatePicker: A free JavaScript Jalali (Persian) and Gregorian (Miladi) dual datepicker library for Blazor applications