Question

I have an ASP.net website that has the following code:

Random r = new Random();

string mustBeUnique = DateTime.Now.Ticks + r.Next(1000);

It appears thought that since Random is based off of time, that two requests that happen simultaneously generate the same random number.

What is the best way to solve this?

Answer 1

If you’re simply looking for a unique identifier, I would recommend using a ‘Guid’ instead.

Its purpose is to be a globally unique identifier:

string mustBeUnique = Guid.NewGuid().ToString();

http://msdn.microsoft.com/en-us/library/system.guid.aspx