Random.Next() sometimes returns same number in separate threads

Question

I have the following class

class Program
{
   static Random _Random = new Random();

   static void Main(string[] args)
   {
      ...
      for (int i = 0;          


        

Answer 1

Random is a pseudo-random number generator and there's nothing preventing it from returning same result for multiple calls. After all there's a probability for this happening. Not to mention that according to the documentation:

Any instance members are not guaranteed to be thread safe.

So you shouldn't be calling the Next method at all from multiple threads.