C# IEnumerable fibonacci sequence

NaiveFibonacciSequenceGenerator.cs

using System;
using System.Collections;

public class NaiveFibonacciSequenceGenerator : IEnumerable
{
    private readonly int sequenceSize;

    public NaiveFibonacciSequenceGenerator(int sequenceSize)
    {
        this.sequenceSize = sequenceSize;
    }

    public IEnumerator GetEnumerator()
    {
        int n1 = 0;
        int n2 = 1;
        int count = 0;

        while (count <= sequenceSize)
        {
            var n1Temp = n1;
            n1 = n2;
            n2 = n1Temp + n2;
            ++count;

            yield return n2 - n1;
        }
    }
}

public class Program
{
    static void Main()
    {
        // Create a generator that will generate 10 Fibonacci numbers
        var generator = new NaiveFibonacciSequenceGenerator(10);
  
        foreach (var num in generator)
        {
            Console.WriteLine(num);
        }
    }
}