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Introduction to Core

ASP.NET Core is the new version of the ASP.NET Web Framework mainly targeted to run on the .NET Core Platform.

ASP.NET Core is a free and open-source web framework, and higher performance than ASP.NET, developed by Microsoft and the community. It is a modular framework that runs on both the full .NET Framework, on Windows, and the cross-platform .NET Core. However, the expected version ASP.NET Core 3 was announced to work only on .NET Core dropping support of .NET Framework.

The framework is a complete rewrite that unites the previously separate ASP.NET MVC and ASP.NET Web API into a single programming model.

ASP.NET Core features
Cross-platform, open-source now runs your app over Linux, Windows, Mac;   i.e., wherever you want.
Fast Development- fast work over the Browsers.
Work in your editors - now you can work not only in Visual Studio. You can also choose Visual Studio code and if you
want to work on your command on the command prompt, then you can.
Despite being a new framework, built on a new web stack, it does have a high degree of concept compatibility with ASP.NET MVC. ASP.NET Core applications support side-by-side versioning in which different applications, running on the same machine, can target different versions of ASP.NET Core. This is not possible with previous versions of ASP.NET.

Diffrence between Asp.Net core and Asp.Net 4.x

Build for Windows, macOS, or LinuxBuild for Windows
Razor Pages is the recommended approach to create a Web UI as of ASP.NET Core 2. x. See also MVC, Web API, and SignalR.Use Web Forms, SignalR, MVC, Web API, WebHooks, or Web Pages
Multiple versions per machineOne version per machine
Develop with Visual Studio, Visual Studio for Mac, or Visual Studio Code using C# or F#Develop with Visual Studio using C#, VB, or F#
Higher performance than ASP.NET 4. xGood performance
Choose .NET Framework or .NET Core runtimeUse .NET Framework runtime

Blazor | Free and Open-Source Web Framework

Blazor is a Single Page Application development framework. The name Blazor is a combination/mutation of the words Browser and Razor (the .NET HTML view generating engine). The implication is that instead of having to execute Razor views on the server in order to present HTML to the browser, Blazor is capable of executing these views on the client.

Blazor lets you build interactive web UIs using C# instead of JavaScript. Blazor apps are composed of reusable web UI components implemented using C#, HTML, and CSS. Both client and server code is written in C#, allowing you to share code and libraries. Blazor is a feature of ASP.NET, the popular web development framework that extends the .NET developer platform with tools and libraries for building web apps.

Blazor uses open web standards without plugins or code transpilation. Blazor works in all modern web browsers, including mobile browsers.

Code running in the browser executes in the same security sandbox as JavaScript frameworks. Blazor code executing on the server has the flexibility to do anything you would normally do on the server, such as connecting directly to a database.

Why should we use Blazor?

There are couple of strong reasons, which indicate why we should use Blazor: 
1. WebAssembly is supported by all major browsers
2. Use C# for interactive web applications
3. Reuse existing libraries
4. Performance is near native
5. Tooling and debugging

Blazor WebAssembly:

Blazor WebAssembly runs on the client in the browser . It downloads everything that it needs to the browser including HTML, CSS, maybe some JavaScript, and possibly images. It also downloads the assemblies that make up the application, and it even downloads the complete .NET runtime that is converted into WebAssembly bytecode. All of this runs completely on WebAssembly, which is a part of all major web browsers, including mobile browsers. This type of Blazor application doesn't need a connection to a server. It just needs to load into the browser, and that's it. A Blazor WebAssembly app consists out of static files, so you don't need a full-fledged server to get this to the browser. You could host the static files on a content delivery network, or CDN, which is relatively cheap and is globally performant. You can also host it on a server in the cloud, in your own data center, or anywhere else. 


Near-Native Performance, runing your app on webassemble is fast. 
App can work completely offline.
No Server Needed, you do not have to maintain the server and keep architecture simple. it require resource processing at client device
No Plugin required, WebAssembly is native part of all major browsers. it takes all static files into browser 
Run in all Modern Browsers 

Blazor Server:

Blazor Server is a server-side Blazor app. App runs inside an ASP.NET website that runs on the .NET runtime. This website then serves the Blazor website and loads Blazor through a WebSocket connection that it uses through SignalR. Using this, UI updates are streamed from the server in real time. This sounds complicated, but you don't have to do anything special to make this work. This all comes out of the box.


Less downloading and loads fast.
Complete ASP.NET Framework.
WebAssembly not needed.
Server Side Keys or Secrets are Safe to use.

Benefits of ASP.NET Core to Develop Web Applications

What is core? 

Asp.Net Core is a cross-platform, open-source framework for the development of internet-connected, cloud-based modern web applications. Through the core framework, it is quite possible to create more effective web apps and also services along with mobile app backends and even IoT apps. In simpler terms, it is a significant redesign of the ASP.NET framework. core comes with benefits like improved performance, tighter security, lesser coding, and so on.

benefits of Asp.Net core:

In order to reduce the higher costs as well as create a custom web application with required features at the same time, Microsoft released its most leading framework is known as ASP.NET. ASP.NET core is developed in such a way that, it could be integrated seamlessly with various client-side frameworks that include Bootstrap, ReactJS & AngularJS. 

ASP.NET Core provides the following benefits:

1. Improved and High Performance with Cross-Platform support
The most obvious and important benefit of the ASP.NET Core framework is its high performance with the new enhancements as well as upgrades, the code actually gets much more optimized which results in improved performance. With core's cross-platform feature we can create applications and deploy them to different platforms like Windows, Linux, and macOS.

ASP.NET Core allows developers to utilize new technologies like Docker, Kubernetes, and other technologies. Microsoft Azure even has support for deploying your application to containers and Kubernetes which is a great option.

2. Asynchronous support using async or await
ASP.NET has excellent support for utilizing asynchronous programming patterns. Async is now implemented in all common .NET Framework classes and most third-party libraries. Most modern applications spend most of their time and CPU cycles waiting for database queries, web service calls, and other I/O operations to complete so one of the reasons ASP.NET Core is faster is its extensive use of asynchronous patterns within the new MVC frameworks.

3. Support Cross-platform
When it comes down to web application development, it is essential to ensure that the application actually supports all of the platforms. The latest ASP.NET Core is actually cross-platform that allows you to easily create web applications that run on Windows, Linux, and Mac. In much simpler terms, the entire backend will be using the same C# code. For instance, utilizing Xamarin, a business can easily create an iOS app and then eventually use the same given code for creating an Android app too. You can hire a dot net developer who can utilize this cross-platform feature.

4. Lesser Code
The latest technologies actually demand less coding and high performance means that the developers can easily optimize the code structure by means of writing much lesser statements of code. So if coding is less, fewer amount hours are required in order to create an application that makes ASP.NET Core much more cost-effective and also developers' favourite.

5. Unified MVC & Web API frameworks
Before ASP.NET Core, developers were most commonly using the MVC and Web API frameworks. MVC was tailored to creating web applications that served up HTML. Web API was designed to create RESTful services using JSON or XML patterns.

With ASP.NET Core, MVC and Web API have been merged together. There was always a lot of overlap between the two frameworks. MVC could always return JSON data instead of HTML. Combining them was a good move and simplifies the development process.

With ASP.NET Core we also have the new Razor Pages. They extend the MVC framework to allow encapsulating the controller and model aspects of a page together with two-way binding and it also reduces code lines and easier to understand. These new razor pages are a replacement for WebForms while using the familiar Razor syntax.

6. Easy Maintenance
Whenever there is less code, it becomes much easier to maintain automatically. While it might not actually be easier for any new developer to easily understand this pattern, a much-experienced developer needs to know how to actually optimize the entire code in ASP.NET core with lesser statements. It essentially means that it not only takes a lesser amount of code to create a web application but it is quite easier to effectively manage and maintain it. It improves the quality of Microsoft app development.

7. Cloud-Based Web Application Development Support
In case anyone has a business then it's a very better option to create a cloud-based application in the current modern era. The major reason for this particular thing is that the ASP.NET Core actually offers different types of web app development as well as mobile backend along with IoT application development. This means ASP.NET Core is the best solution for the business requirements of the current times. Also, ASP.NET Core can easily help in developing great and cross-platform web applications.

8. Multiple environments support
This new environment feature allows you to easily differentiate parts of your code for their behaviour in development, staging, production, etc. For example, it is used within your Startup.cs file to help configure your application. In this case, whether or not we want to show a more detailed exception page for development only.

Multiple environments are useful for using different CSS or Javascript files like Use your CDN in production, but local files during development.

9. Dependency Injection
This feature of ASP.NET Core is built-in dependency injection. It is heavily used within ASP.NET MVC itself. It is the preferred way that things like logging contexts, database contexts, and other things are passed into your MVC controllers.

DI frameworks provide IoC containers that allow developers to offload control of this process to the framework. This lets us decouple our modules from their concrete dependencies, improving the testability and extensibility of our applications.

ASP.NET Core is a very interesting technology to create a cross-platform and robust web application. Since most businesses look for different ways to develop an app fast and even launch it in the entire market sooner than possible, ASP.NET Core development is considered to be the best way to do this.

Introduction to .Net 6

.NET 6 offers “massive” gains in performance as well as native support for Apple Silicon and improved support for Arm64, a bulletin on the production release said.

.NET 6 is:

Production stress-tested with Microsoft services, cloud apps run by other companies, and open source projects.
Supported for three years as the latest long term support (LTS) release.

Unified platform across browser, cloud, desktop, IoT, and mobile apps, all using the same .NET Libraries and the ability to share code easily.

Performance is greatly improved across the board and for file I/O in particular, which together result in decreased execution time, latency, and memory use.

C# 10 offers language improvements such as record structs, implicit using, and new lambda capabilities, while the compiler adds incremental source generators. F# 6 adds new features including Task based async, pipeline debugging and numerous performance improvements.

Visual Basic has improvements in the Visual Studio experience and for Windows Forms project open experience.

Hot Reload enables you to skip rebuilding and restarting your app to view a new change — while your app is running — supported in Visual Studio 2022 and from the .NET CLI, for C# and Visual Basic.

Cloud diagnostics have been improved with OpenTelemetry and dotnet monitor, which is now supported in production and available with Azure App Service.

JSON APIs are more capable and have higher performance with a source generator for the serializer.

Minimal APIs introduced in ASP.NET Core to simplify the getting started experience and improve the performance of HTTP services.

Blazor components can now be rendered from JavaScript and integrated with existing JavaScript based apps.

WebAssembly AOT compilation for Blazor WebAssembly (Wasm) apps, as well as support for runtime relinking and native dependencies.

Single-page apps built with ASP.NET Core now use a more flexible pattern that can be used with Angular, React, and other popular frontend JavaScript frameworks.

HTTP/3 has been added so that ASP.NET Core, HttpClient, and gRPC can all interact with HTTP/3 clients and servers.

File IO now has support for symbolic links and has greatly improved performance with a re-written-from-scratch FileStream.

Security has been improved with support for OpenSSL 3, the ChaCha20Poly1305 encryption scheme, and runtime defense-in-depth mitigations, specifically W^X and CET.

Single-file apps (extraction-free) can be published for Linux, macOS, and Windows (previously only Linux).

IL trimming is now more capable and effective, with new warnings and analyzers to ensure correct final results.

Source generators and analyzers have been added that help you produce better, safer, and higher performance code.

Source build enables organizations like Red Hat to build .NET from source and offer their own builds to their users.