List<int> items = new List<int>(new int[1000]);
foreach(int item in CollectionMarshal.AsSpan(items))
{
     ..........
}

var asSpan = CollectionMarshal.AsSpan(items); 
for(int i; i < asSpan.Length; i++)
{
     var item = asSpan[i];
}

Episode 104 - C# with Mads Torgersen
Sep 9, 2022 

Refactor code to use new C# language features 

Mads takes a whirlwind tour through the language features in the upcoming C# 11. Static virtual members, list patterns, required properties and raw string literals are all among the new tools in your toolbox for writing cleaner, safer, more general and more concise code in C#. 

Announcement: A roadmap update on the VS Code C# extension · Issue #5276 · OmniSharp/omnisharp-vscode 

I found myself in need of quickly converting my C# Console application into a Web application, primarily, I was asked to expose our Console app’s logic through an API with very little time to manage it .

C# Gains Most in Programming Language Popularity Index 

C++ For C# Developers