Anyone please clear my doubt on reference Types?

Question

 Consider the Below Code,

int[] intArray = new int[] { 10, 20, 20, 12, 15, 22, 11, 45, 15, 45 };
intArray.Distinct();
foreach (int num in intArray)
{
Console.Write(num + " ");
}

Array is a Reference type. But when I use Distinct on Array it is not affected. I am confused here. Please anyone clear it.