In this C# 8 tutorial, I am going to introduce a selection of currently planned features which will most probably end up in the final release. All of the C# 8 features are still early in development and are likely to change. 

Do not declare virtual events in a base class and override them in a derived class. The C# compiler does not handle these correctly, and it is unpredictable whether a subscriber to the derived event will actually be subscribing to the base class event 

Learn Blazor WebAssembly and Web API on .NET 6 by building a shopping cart application using C#. This course also provides a guide on how to integrate a payment gateway into your Blazor WebAssembly component, so that a user is able to pay for products through your application using a debit or credit card or PayPal account.

⭐️ Course Contents ⭐️
⌨️ (0:00:00) Introduction
⌨️ (0:00:51) Create the Database using EF Core Code First Database Migrations
⌨️ (0:26:05) Retrieve Product Data from Database (Web API component)
⌨️ (0:30:17) Create Classes for Data Transfer Objects (DTOs)
⌨️ (0:36:22) Create ProductRepository Class (Repository Design Pattern)
⌨️ (0:43:05) Create ProductController Class
⌨️ (0:51:08) Create DtoConversion Class (DTO Conversion Extension methods)
⌨️ (0:57:45) Display Product Data to User (Blazor WebAssembly Component)
⌨️ (1:39:59) Display Data for Specific Product to User (Web API and Blazor)
⌨️ (2:06:07) Add Product to Shopping Cart (Web API and Blazor)
⌨️ (2:52:40) Remove Product from Shopping Cart (Web API and Blazor)
⌨️ (3:14:03) Update the Quantity of Products in the Shopping Cart (Web API, Blazor, Blazor JavaScript Interoperability)
⌨️ (3:44:01) Update the Header Menu in Response to a Change to the State of the Shopping Cart (Creating Custom Events in Blazor)
⌨️ (4:04:48) Integration of PayPal Payment Gateway into Blazor Component
⌨️ (4:36:03) Dynamically Populate the Side-Bar Menu (Web API and Blazor)
⌨️ (5:05:44) Optimise Code for Performance (Web API and Blazor)
⌨️ (5:08:26) Use Include Extension Method in LINQ Query (Web API)
⌨️ (5:14:00) User Local Storage Functionality (Blazor)
⌨️ (5:35:42) Outro 

During the last Build conference, Microsoft has announced the next version of Visual Studio with C# 7.3 support. This is yet another minor language update with some quite interesting features. The main change was related to generics, starting from C# 7.3 there 3 more constraints: unmanaged, System.Enum and System.Delegate. 

Introducing Microsoft Edge Beta: Be one of the first to try it now 

These are the customer-reported issues addressed in this version:

Visual Studio crashes when you open a solution with a test project.
Visual Studio Freezes in Debug with Chrome.
Failure to install HelpViewer.
UI delay while typing R code.
C# 7.0 Regression in Tuples.
Xamarin - Dynamic Type Platform not supported exception.
Xamarin – Dynamic object is not supported.
Xamarin - Xamarin.iOS: ArgumentNullException for instruction parameter in Mono.Linker's MarkException() method.

enum typename{enumerator-list}

enum Day{SAT,SUN,MON,TUE,WED,THU,FRI}

Day  day1,day2; 
day1 = SAT; 
day2 = SUN;

enum Day{SAT=1,SUN=2,MON=4,TUE=8,WED=16,THU=32,FRI=64}

enum Day{SAT=1,SUN,MON,TUE,WED,THU,FRI}

enum Answer{NO=0,FALSE=0,YES=1,TRUE=1,OK=1}

enum Answer{NO=0,FALSE=0,YES=1,YES=2,OK=1}

enum Color{RED,GREEN,BLUE,BLACK,ORANGE} 
enum Time{SECOND,MINUTE,HOUR} 
enum Date{DAY,MONTH,YEAR} 
enum Language{C,DELPHI,JAVA,PERL} 
enum Gender{MALE,FEMALE}

enum Suit {Clubs, Diamonds, Hearts, Spades};
enum Jewels {Diamonds, Emeralds, Opals, Rubies, Sapphires};

enum class Suit {Clubs, Diamonds, Hearts, Spades};
enum class Jewels {Diamonds, Emeralds, Opals, Rubies, Sapphires};

enum Suit {Clubs, Diamonds, Hearts, Spades};
Suit var1 = Clubs;
int var2= Clubs;

enum class Jewels {Diamonds, Emeralds, Opals, Rubies, Sapphires};
Jewels typeJewel = Jewels::Emeralds;
int suitValue = static_cast<int>(typeJewel);

// Demonstrating type-safe and non-type-safe enumerations
#include <iostream>
using std::cout;
using std::endl;
// You can define enumerations at global scope
//enum Jewels {Diamonds, Emeralds, Rubies}; // Uncomment this for an error
enum Suit : long {Clubs, Diamonds, Hearts, Spades};
int main()
{
// Using the old enumeration type...
Suit suit = Clubs; // You can use enumerator names directly
Suit another = Suit::Diamonds; // or you can qualify them
// Automatic conversion from enumeration type to integer
cout << "suit value: " << suit << endl;
cout << "Add 10 to another: " << another + 10 << endl;
// Using type-safe enumerations...
enum class Color : char {Red, Orange, Yellow, Green, Blue, Indigo, Violet};
Color skyColor(Color::Blue); // You must qualify enumerator names
// Color grassColor(Green); // Uncomment for an error
// No auto conversion to numeric type
cout << endl
<< "Sky color value: "<< static_cast<long>(skyColor) << endl;
//cout << skyColor + 10L << endl; // Uncomment for an error
cout << "Incremented sky color: "
<< static_cast<long>(skyColor) + 10L // OK with explicit cast
<< endl;
return 0;
}

we extract language rankings from GitHub and Stack Overflow, and combine them for a ranking that attempts to reflect both code (GitHub) and discussion (Stack Overflow) traction. The idea is not to offer a statistically valid representation of current usage, but rather to correlate language discussion and usage in an effort to extract insights into potential future adoption trends.