Is Array Monotonic[Medium] C#

Approach: Use two boolean flags increasing and decreasing initially set to true, loop though array start from i = 1 and update those flags by comparing array[i] and array[i-1], return the or operation of the two flags

using System;

public class Program {
    public static bool IsMonotonic(int[] array) {
        var isNonDecreasing = true;
        var isNonIncreasing = true;
        for (int i = 1; i < array.Length; i++)
        {
            if(array[i] < array[i-1])
            {
                isNonDecreasing = false;
            }
            if(array[i] > array[i-1])
            {
                isNonIncreasing = false;
            }
        }
        return isNonIncreasing||isNonDecreasing;
    }
}