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

System.Threading.Thread.Sleep(1);
long code = (long)DateTime.UtcNow.Subtract(new DateTime(2018, 1, 1, 0, 0, 0, DateTimeKind.Utc)).TotalMilliseconds;

OR

System.Threading.Thread.Sleep(1000);
long code = (long)DateTime.UtcNow.Subtract(new DateTime(2018, 1, 1, 0, 0, 0, DateTimeKind.Utc)).TotalSeconds;