Problem in generating random number [duplicate]

Answer 1

You should create just one Random() object and reuse it instead of creating a new one for each random number you generate.

The reason is that every time you create a new Random object it seeds itself from the current time. If you create multiple Random objects within a short period of time then then they will seed with the same time, and so they will generate the same numbers.

Answer 2

When you create a new Random() without specifying a seed, it seeds it using the current system time.

I don't remember off the top of my head the precision it uses (ticks? milliseconds?) but if you create new Random objects and use them in quick succession, they could easily have the same seed and thus return the same results.

Create one new Random(), and call .Next(min, max) on it repeatedly.