static void Main(string[] args)
{
HashMap <int, string> hashMap = new HashMap <int, string>();
Random random = new Random();
for (int i = 0; i < 100; i++)
{
int number = random.Next(0, 300);
if (hashMap.ContainsKey(number))
{
i--;
continue;
}
hashMap.Add(number, number.ToString());
}
}
