Random class

You can do it like:

        Random r;
        public Form1()  //constructor of class
        {           
            r = new Random();
            int num1 = r.Next(1, 601); //1st option
            int num2 = GetRandomNumber(); //2nd option
        }

        private int GetRandomNumber()
        {
            return r.Next(1, 601);
        }

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Mitja