Remove duplicate items from array, final answer

gistfile1.cs

public static int[] removeDuplicates(int[] A)
{
    int writeIndex = 0;
    for (int i = 1; i < A.Length; i++)
    {
        if (A[writeIndex] != A[i])
        {
            writeIndex++;
            A[writeIndex] = A[i];
        }
    }
    for (int i = writeIndex + 1; i < A.Length; i++)
    {
        A[i] = 0;
    }

    return A;
}