How to generate non-negative random numbers(integer) using RNGCryptoServiceProvider C#

I need to generate non-negative random integers in my code. The example below generates integers;

using (RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider())
    {
        // Buffer storage.
        byte[] data = new byte[4];

        // Ten iterations.
        for (int i = 0; i < 10; i++)
        {
        // Fill buffer.
        rng.GetBytes(data);

        // Convert to int 32.
        int value = BitConverter.ToInt32(data, 0);
        Console.WriteLine(value);
        }
    }

Ref: http://ift.tt/1GgaMYq But it gives both positive and negative values. How do I generate only non-negative random integers? I was earlier using Random.Next() which was giving me positive integers.