.NET Core placed high in a web-dominated ranking of development frameworks published by CodinGame, which provides a tech hiring platform.
Frameworks: React is 2021’s most sought-after framework
Node.js, React and .NETCore are currently the most popular frameworks amongst developers.
React is the most sought-after framework: 59% of tech recruiters are on the lookout for developers who know React. 

Day 1 - Installing and Running .NET Core on a Windows Box
Day 2 - Taking a Look at the Visual Studio Templates for .NET Core
Day 3 - Running a .NET Core app on a Mac
Day 4 - Creating a NuGet Package from .NET Core app
Day 5 - Creating a Test Project from .NET Core
Day 6 - Migrating an existing .NET Core to csproj
Day 7 - Creating an ASP.NET Core Web Application 

.NET 7 minimal API from scratch | FULL COURSE | clean architecture, repository pattern, CQRS MediatR

In this course I want to provide you a project structure and code organization to get you started with real .NET 7 minimal API projects. It's a full course on this topic where I start from creating and explaining the project structure, setting up different layers using EF Core, repository pattern, CQRS and MediatR. The biggest part of the video is however around the .NET 7 minimal API, taking you from the initial setup, explaining route handlers, implementing all CRUD operations and so on. Last but not least, this course walks you through the process of refactoring the .NET 7 minimal API so that it becomes readable, maintainable and scalable. At the end, you'll have a full project structure organized according to modern architectural patterns that you can take as a template for your own projects.

Contents
1. Intro: 00:00
2. Structuring the solution: 01:00
3. Coding the domain layer: 05:25
4. Coding the data access layer: 08:22
5. Creating repositories: 11:17
6. Adding migrations and database update: 22:30
7. CQRS with MediatR: 29:07
8. Route and rout handlers: 52:06
9. Dependency injection: 55:52
10. Implementing GET by ID : 57:40
11. Implementing POST route: 01:00:26
12. Implementing GET all route: 01:03:41
13. Implement PUT and DELETE: 01:04:57
14. Testing with Postman: 01:09:01
15. Is there a problem? 01:12:41
16. Refactoring service registrations: 01:15:49
17. Refactoring route registrations: 01:20:01
18. Automatic registration of endpoints: 01:26:28
19. Introducing route groups:  01:31:43
20. Extract lambdas into instance methods: 01:34:31
21: Model validation with endpoint filters: 01:45:58
22. Global exception handling: 01:55:10
23. Conclusions: 01:59:49 

Performance Improvements in .NET 9

Each year, summer arrives to find me daunted and excited to write about the performance improvements in the upcoming release of .NET. “Daunted,” because these posts, covering .NET 8, .NET 7, .NET 6, .NET 5, .NET Core 3.0, .NET Core 2.1, and .NET Core 2.0, have garnered a bit of a reputation I want to ensure the next iteration lives up to. And “excited,” because there’s such an abundance of material to cover due to just how much goodness has been packed into the next .NET release, I struggle to get it all written down as quickly as my thoughts whirl.

If Not a And b Then
  ...
Else
  ...
EndIf

if(!(a) && b)
{
...
}
else
{
}

public interface ICommand
{
}

public class Command1 : ICommand
{
}

public class Command2 : ICommand
{
}

ICommand command = new Command1();
if (!(command is Command2))
{

}

if (command is not Command2)
{

}

if ((command is ICommand) && !(command is Command2))
{

}

if (command is ICommand and not Command2)
{

}

if (command is Command1 or Command2)
{

}

var number = new Random().Next(1, 10);
if (number > 2 && number < 8)
{

}

if (number is > 2 and < 8)
{

}

public static bool IsLetterOrSeparator(char c) =>
   (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') || c == '.' || c == ',';

public static bool IsLetterOrSeparator(char c) =>
   c is (>= 'a' and <= 'z') or (>= 'A' and <= 'Z') or '.' or ',';

 var number = new Random().Next(1, 10);
 if (number <= 0)
 {
     Console.WriteLine("Less than or equal to 0");
 }
 else if (number > 0 && number <= 10)
 {
     Console.WriteLine("More than 0 but less than or equal to 10");
 }
 else
 {
     Console.WriteLine("More than 10");
 }

// C#9.0
 switch (number)
 {
     case <= 0:
         Console.WriteLine("Less than or equal to 0");
         break;
     case > 0 and <= 10:
         Console.WriteLine("More than 0 but less than or equal to 10");
         break;
     default:
         Console.WriteLine("More than 10");
         break;
 }

// C#7.0
 switch (number)
 {
     case int value when value <= 0:
         Console.WriteLine("Less than or equal to 0");
         break;
     case int value when value > 0 && value <= 10:
         Console.WriteLine("More than 0 but less than or equal to 10");
         break;
     default:
         Console.WriteLine("More than 10");
         break;
 }

 var message = number switch
 {
     <= 0 => "Less than or equal to 0",
     > 0 and <= 10 => "More than 0 but less than or equal to 10",
     _ => "More than 10"
 };

private static int GetDiscount(Product p) => p switch
        {
            Food => 0, // Food _ => 0 before C# 9
            Book b => 75, // Book b _ => 75 before C# 9
            _ => 25
        };

.NET Core console app running on Raspberry Pi  

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public class Person 
{ 
    public string _firstName; 
 
    public string FirstName 
    { 
        get 
        { 
            return _firstName; 
        } 
        set 
        { 
            _firstName = value; 
        } 
    }  
}

public string _firstName; 
public string FirstName 
{ 
    get 
    { 
        return _firstName; 
    } 
    private set 
    { 
        _firstName = value; 
    } 
}

public class Person
{
   public string FirstName { get; set; }
}

public class User
{
   public string Name { get; private set; }
}

public class User
{
   public string Name { get; }
}

public class Foo
{
   public string FirstName { get; set; } = "Initial Value";
}

public class Foo
{  
   public DateTime DateOfBirth { get; set; }
   public int Age => DateTime.Now.Year - DateOfBirth.Year;  
}

public class User
{
   public string Name { get; private set; }
}

var user = new User
{
   Name = "User 1" // Compile Error
};

The property or indexer 'User.Name' cannot be used in this context
because the set accessor is inaccessible [CS9Features]csharp(CS0272)

public class User
{
  public User(string name)
  {
    this.Name = name;
  }

  public void SetName(string name)
  {
    this.Name = name;
  }

  public string Name { get; private set; }
}

public class User
{
   public string Name { get; init; }
}

var user = new User
{
   Name = "User 1"
};

// Compile Time Error
// Init-only property or indexer 'User.Name' can only be assigned in an object initializer,
// or on 'this' or 'base' in an instance constructor or an 'init' accessor. [CS9Features]csharp(CS8852)
user.Name = "Test";

public class User
{
   public string Name { get; init; }

   public User(string name)
   {
     this.Name = name; // Works fine
   }

   public void SetName(string name)
   {
     this.Name = name; // Compile Time Error
   }
}

    public class Product
    {
        public Product(string name)
        {
            _name = name;
        }

        private readonly string _name;

        public string Name => _name;
    }

    public class Person
    {
        private readonly string _name;

        public string Name
        {
            get => _name;
            init => _name = value;
        }
    }