What's New in C# 8?

One Minute Answer: 

C# 8 was released in September 2019. It has come with a lot of good features.

• Default Interface Methods
• Property Pattern
• Type Pattern
• Tuple Pattern
• Using declaration
• Null-coalescing assignment
• Indices and ranges *
• Nullable reference types *
• Asynchronous streams *

Add On Answer: 

• C# 8 is fully supported in .NET Core 3.0 and .NET Standard 2.1
• C# 8 is partially supported in .NET Frameworks 4.8 (*). But it will be fully supported in the up coming .NET 5.
• C# 8 compiler exists Visual Studio 2019 v16.3 and above