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

My first answer did not address the uniqueness problem. My second one does:

static int counter;
public static int GetUniqueNumber()
{ 
    return counter++; 
}

If you want to have unique numbers across app restarts, you need to persist the value of counter to a database or somewhere else after each and every GetUniqueNumber call.