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1. `union` Result in C# 15 .NET 11 `union` Result in C# 15 .NET 11

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   public interface IResult;

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   public interface IResult<TValue> : IResult;

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   public readonly record struct Success;

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   public readonly record struct Error(string? Message = null, IReadOnlyList<Exception>? Exceptions = null)

2. Pattern Matchings Pattern Matchings

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   if (randomShape is Circle { Diameter: 10, Radius: < 5 and > 2, Area: <= 15 } c)

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   {

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       Console.WriteLine($"This is my circle. Area: {c.Area}");

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   }

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   if (randomShape is not null)

3. Constructor & Extension Deconstruct Constructor & Extension Deconstruct

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   class Person {

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       public Person (string first, string last) => (this.First, this.Last) = (first, last);

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   }

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   public static class Extensions {

4. From SQL Interpolated String From SQL Interpolated String

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               var dbResult = await this._readDbContext.ProductCategories.FromSqlInterpolated($@"

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       SELECT TOP 1 *

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       FROM [biz].[ProductCategories] t

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       WHERE NOT EXISTS (SELECT 1

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                          FROM [biz].[ProductCategories]

5. Git Action to build "main" branch o ... Git Action to build "main" branch o push

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   name: Build main branch on push

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   on:

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     push:

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       branches: [ main ]

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     pull_request:

6. Static interface in C# 10.0 Static interface in C# 10.0

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   public interface IMath

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   {

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       static int Add(int x, int y) => x + y;

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       abstract static int Sub(int x, int y);

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       abstract static int Mul(int x, int y);