Generate couples of random images

[p0ly]

Hey guys i want to generate in a grid[4,4] with equal couples of random images(like in double match game), and i don't
know why after i run the code those "random" images are displayed like
[sameImage0][sameImage0][sameImage1][sameImage1]. I want that the same
images are away from each other. I am gonna copy the part of function that
generates those random images and please tell me what's going on?

int cnt = 0;
            while (cnt != 16)
            {

                Random RandomNumber = new Random();
                int current = RandomNumber.Next(0, listImages.Count);
                if (numbers[current] < 2)
                {
                   numbers[current]++;
                   randomImages.Add(listImages[current]);
                   cnt++;
                }

            }
Thanks a lot in advance!