How to Generate Unique Number of 8 digits?

Question

I am using this code to generate a 8 digit unique number.

byte[] buffer = Guid.NewGuid().ToByteArray();
return BitConverter.ToUInt32(buffer, 8).ToString();
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Answer 1

Here is another version

public static string GetFormNumber()
    {
        byte[] buffer = Guid.NewGuid().ToByteArray();
        var FormNumber = BitConverter.ToUInt32(buffer, 0) ^ BitConverter.ToUInt32(buffer, 4) ^ BitConverter.ToUInt32(buffer, 8) ^ BitConverter.ToUInt32(buffer, 12);
        return FormNumber.ToString("X");

    }

it assures to be unique!