Registration routine

Question

I'm working on making an application that is, basically, a serial number...Putter inner thingy.
You enter a correct serial number, things happen, stuff changes.
Here is the routine:

("E7M-0" + rand.Next(1001, 9999) + "-0" + rand.Next(130, 245) + "-19" + rand.Next(22, 44) + "-" + rand.Next(523, 984) + rand.Next(1, 9) + "\r\n");

I've made a generator that outputs all these "keys" but would like to know how would I convert this to an if type statement.

Any help? :)