int[] intArr = new int[100];
ArrayList myList = new ArrayList();
Random rnd = new Random();
while (myList.Count < 100)
{
int num = rnd.Next(1, 101);
if (!myList.Contains(num))
myList.Add(num);
}
for (int i = 0; i <100; i++)
{
intArr[i] = (int)myList[i];
Console.Write("{0} ", intArr[i]);
Console.WriteLine();
}