如何生成5个不同的随机数，并且必须至少包含1个负数(asp.net webforms)

protected void Page_Load(object sender, EventArgs e)
{
    List<int> randomNumbers = GenerateRandomNumbers(5);
    bool hasNegativeNumber = false;

    foreach (int number in randomNumbers)
    {
        if (number < 0)
        {
            hasNegativeNumber = true;
            break;
        }
    }

    if (!hasNegativeNumber)
    {
        // 生成一个负数
        int negativeNumber = GenerateNegativeNumber();
        randomNumbers[0] = negativeNumber;
    }

    // 输出随机数
    foreach (int number in randomNumbers)
    {
        Response.Write(number.ToString() + "<br>");
    }
}

private List<int> GenerateRandomNumbers(int count)
{
    List<int> randomNumbers = new List<int>();
    Random random = new Random();

    while (randomNumbers.Count < count)
    {
        int randomNumber = random.Next(-100, 101); // 生成-100到100之间的随机数
        if (!randomNumbers.Contains(randomNumber))
        {
            randomNumbers.Add(randomNumber);
        }
    }

    return randomNumbers;
}

private int GenerateNegativeNumber()
{
    Random random = new Random();
    int negativeNumber = random.Next(-100, 0); // 生成-100到-1之间的随机数
    return negativeNumber;
}