This C# code defines benchmark tests to compare the performance of boxing (using a non-generic number class) versus non-boxing (using a generic number class) operations on numeric values.

BoxingPerformanceBenchmark.cs

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

public interface INumber
{
    object NumericValue { get; set; }
}

public class Number : INumber
{
    public object NumericValue { get; set; }
}

public interface INumber<T>
{
    T NumericValue { get; set; }
}

public class Number<T> : INumber<T>
{
    public T NumericValue { get; set; }
}

public class BoxingPerformanceBenchmark
{
    private readonly Number nonGenericNumber = new Number { NumericValue = 10 };
    private readonly Number<int> genericNumber = new Number<int> { NumericValue = 10 };

    [Benchmark]
    public void BoxingBenchmark()
    {
        var currentValue = nonGenericNumber.NumericValue;
        nonGenericNumber.NumericValue = 20;
    }

    [Benchmark]
    public void NonBoxingBenchmark()
    {
        var currentValue = genericNumber.NumericValue;
        genericNumber.NumericValue = 20;
    }
}

class Program
{
    static void Main(string[] args)
    {
        var benchmarkSummary = BenchmarkRunner.Run<BoxingPerformanceBenchmark>();
    }
}