Random without duplicates

class CRandom
{
    public CRandom()
    {
        rand = new System.Random();
    }

    public void RandomSequence(int[] arr)
    {
        for (int i = 0; i < arr.Length; i++)
        {
            arr[i] = rand.Next(1, 50);
            for (int j = 0; j < i; j++)
            {
                while (arr[i] == arr[j])
                {
                    arr[i] = rand.Next(1, 50);
                }
            }
        }
    }

    private System.Random rand;

}