Generate Random Numbers using C#

Random randNum = new Random();

randNum.Next();

That's all it takes. The creation of a Random object (of the System.Random class) and calling its Next() method, which is going to return a non-negative random number as an integer.
EX:

Random randNum = new Random();

randNum.Next(108); // No larger than 108

randNum.Next(1, 108); // No larger than 108, no smaller than 1