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

If you want a unique number between 10000000 and 99999999, start an integer from 10000000 and just start incrementing it. Generating sequentially ordered numbers is no less random than any other generated sequence, and a whole lot easier to generate.