Skip a random iteration if the list is null

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C#

Visual-Studio

Hi.

I have a Random method:

private string Random(Random random)
{
    if (random.Next(animals.Count) && randomAnimal.Name != null)
    {
        txtName.Text = randomAnimal.Name;
        return randomAnimal.Name;
    }
    else if (randomAnimal.Specie != null)
    {
        txtSpecie.Text = randomAnimal.Specie;
        return randomAnimal.Specie;
    }
    else
    {
        return MessageBox.Show("Failure").ToString();
    }
}

What I have tried:

As you can see this basically displays a random item from a List 'animals'

I also make that whatever is displayed in the textbox it then is being set to null.

Is it possible to skip random iteration and start the Random method all over again to generate not null values in the text boxes?

The point is that it sometimes add the random item only to txtName or txtSpecie. If, for example it is displayed in txtName it make the txtName value null in the list. I want to make sure that when random is being generated and the next random value is null it will not try to display but instead start to generate the random all over again.

Thanks in advance