Can Random.Next() be predicted from its outputs

Having this (simplified) C# class:

public static class RandomValue
{
    private static readonly Random s_random = new Random();

    public static int GetRandomValue()
    {
        lock (s_random)
        {
            return s_random.Next();
        }
    }
}

Is it possible to predict the next value of GetRandomValue() by looking at the values generated by this method?

Assumptions (for the sake of the question):

• The attacker does not know the seed (of course).
• The attacker can observe an unlimited number of subsequent results of GetRandomValue().

I'm asking because I've seen some code using a similar approach to generate some kind of access tokens. This code was not written by me and I would probably have used one of .NET's crypto random classes. I'm just curious whether this is still sufficiently secure.