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Modernizing a codebase for C# 9

There are lots of cases that you can improve. The examples use nullable reference types, but only the WhenNotNull example requires it.

Use the property pattern to replace IsNullorEmpty

Consider adopting the new property pattern, wherever you use IsNullOrEmpty.

string? hello = "hello world";

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using System;
using System.Text.Json;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;
using static Microsoft.AspNetCore.Builder.ArgumentType;

namespace Microsoft.AspNetCore.Builder
{
    public static class RequestDelegateExtensions

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using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;
using System;

namespace delegate_interface
{
    public class Program : IFoo
    {
        const int InnerLoopCount = 10000;

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const int maxBuffer = 1024;

while (true)
{
    var result = await application.Output.ReadAsync();
    var buffer = result.Buffer;

    // Check if we have enough to perform a write
    if (buffer.Length >= maxBuffer)
    {

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using System;
using System.Collections.Generic;
using System.Diagnostics;

namespace SimRing {
    class Program {
        static void Main(string[] args) {
            const int n = 1000;
            const int m = 1000;

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using System;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Routing;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore;
using Microsoft.Extensions.DependencyInjection;

public class Startup
{

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using System;
using System.Collections.Generic;
using System.Collections;
using System.Diagnostics;
using System.Runtime.CompilerServices;

namespace IListPerformance
{
    public class Program
    {

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public static void Main(string[] args)
        {
            var x = Flip(10000);
            var y = FlipNew(10000);
            ////var bench = new ReverseBench();
            ////bench.FlipInSets64Bit();
            //BenchmarkRunner.Run<ReverseBench>();
        }

        public unsafe static ulong Flip(ulong data)

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using BenchmarkDotNet.Attributes;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Numerics;
using System.Runtime.CompilerServices;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using BenchmarkDotNet.Configs;

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using System;

namespace PixelVision.Engine.Chips.Graphics.Sprites
{
    public interface ITextureData
    {
        int Width { get; }
        int Height { get; }
        int GetPixel(int x, int y);
        void SetPixel(int x, int y, int value);